Continuing Education Activity

Sleep is a reversible neurobehavioral state characterized by reduced awareness, altered metabolism, and distinct electroencephalographic patterns across nonrapid eye movement and rapid eye movement stages that cycle within a circadian rhythm. Sleep architecture varies across the lifespan, with age-related changes in stage distribution and increased vulnerability to fragmentation and circadian disruption, which can impair cognition and increase morbidity. This course equips the clinician with knowledge of sleep staging criteria, electroencephalographic features, and polysomnographic interpretation, thereby improving the ability to distinguish normal variants from pathological findings and to accurately identify sleep disorders. Emphasis on arousal analysis and microstructural elements enhances diagnostic precision and clinical decision-making. Collaboration within an interprofessional team, including sleep specialists, neurologists, and respiratory therapists, strengthens comprehensive evaluation and coordinated management, leading to earlier diagnosis, optimized treatment strategies, and improved patient-centered outcomes.

Objectives:

• Apply sleep staging criteria to polysomnography to classify wakefulness, nonrapid eye movement, and rapid eye movement sleep, and to communicate findings effectively with sleep technologists and interdisciplinary health care team members.
• Assess sleep history, safety risk, and occupational or school contributors to circadian disruption to guide diagnostic evaluation.
• Interpret arousal-related phenomena and sleep fragmentation in the context of common sleep disorders to inform referral and treatment planning.
• Implement interdisciplinary communication among sleep medicine specialists, pulmonologists, ear, nose, and throat specialists, psychiatrists, neurologists, and school health staff to improve patient outcomes.

Introduction

Sleep is the natural, periodic suspension of consciousness, characterized by reduced awareness and altered metabolism. The sleep-wake cycle is one of the most important circadian rhythms, alternating periodically over about 24 hours.[1] Sleep is considered a reversible behavioral state marked by perceptual disengagement from and unresponsiveness to the environment, characterized by distinct neurophysiological patterns, including the nonrapid eye movement and rapid eye movement sleep stages.[2] 

This phenomenon is highly conserved across endotherms (mammals and birds), indicating that it serves fundamental biological functions. The amount of sleep varies significantly across different species, influenced by factors such as diet, body size, and ecological conditions. Among mammals classified as either omnivores or carnivores, humans experience some of the briefest sleep durations.[3] This article discusses sleep physiology and architecture across the lifespan and assesses the clinical implications of their disruption. 

Function

The primary functions of sleep encompass several critical processes: restoration and recovery following wakeful activities to ensure optimal performance during subsequent wakefulness;[4] memory consolidation and synaptic plasticity;[5] brain clearance through glymphatic function to eliminate metabolic waste;[6][7] and metabolic, immunological, and endocrine processing.[8] Additionally, sleep facilitates the inactivation of catecholamines, which supports the repair and rejuvenation of brain and body systems.[9] Nonrapid eye movement (NREM) and rapid eye movement (REM) sleep serve complementary roles: NREM sleep, particularly slow-wave sleep, enhances information processing, synaptic plasticity, and cellular maintenance, whereas REM sleep appears to select brain networks that have benefited from recovery processes.

Physiological Effects of Aging on Sleep

The amount of sleep humans require varies with age.[10] Generally, the need for sleep decreases and stabilizes during middle age, as illustrated in Table 1.

Table

Table 1. Sleep Duration Based on Age Group.

Adolescents experience a natural delay in their sleep patterns, but still need an optimal amount of sleep.[11] Adequate sleep is vital for children and adolescents, as it improves their concentration, behavior, learning capacity, memory, emotional well-being, overall quality of life, and mental and physical health. Conversely, insufficient sleep can increase the chances of accidents, injuries, hypertension, obesity, diabetes, and depression. For adolescents, lack of sleep may also elevate the risk of self-harm, suicidal ideation, and suicide attempts.

Results from epidemiological studies indicate that adults aged 18 and older benefit most from 7 hours of sleep per night, with deviations from this amount linked to reduced lifespan.[3] Hunter-gatherer communities sleep 6 to 8 hours, with lower rates of insomnia (2%) than in industrialized societies (10% to 30%). Sleep duration correlates with ecological role and diet rather than brain size, suggesting energy conservation. Furthermore, brain temperature drops during non-REM sleep but increases during REM sleep; the duration of REM sleep inversely correlates with body temperature across species, suggesting a role in temperature regulation. Aging significantly impacts various stages of sleep, leading to notable changes in sleep architecture (as shown in Table 2).

Table

Table 2. Sleep Architecture Changes by Age.

REM, rapid eye movement

Total sleep time decreases as older adults spend more time in bed but experience less actual sleep. Sleep efficiency declines, with this parameter continuing to worsen even after age 60. Slow-wave sleep (N3), the deepest sleep stage, shows a marked decrease, with the most dramatic reduction occurring between young adulthood and midlife.[2] REM sleep decreases modestly, with a more pronounced effect in women.

Conversely, lighter sleep stages, such as stage N1, increase, reflecting more fragmented, lighter sleep, while stage N2 also increases, likely compensating for the loss of deeper stages. Additionally, sleep onset latency increases, meaning it takes longer to fall asleep. Wake after sleep onset and the arousal index both increase, indicating more frequent nighttime awakenings and greater sensitivity to stimuli, respectively.

Moreover, the arousal threshold decreases, making older adults more sensitive to environmental disturbances. Declining sleep patterns serve as a broad marker of biological aging, reflecting shifts in metabolic, inflammatory, and circadian activity.[11] Circadian changes associated with aging include a tendency to fall asleep and wake up earlier (phase advance), reduced tolerance to phase shifts such as jet lag, increased daytime napping, and decreased amplitude of circadian rhythms.[12] Regarding hormonal implications, the decline in slow-wave sleep from early adulthood to midlife is mechanistically linked to decreased growth hormone secretion, while reduced REM sleep in later life correlates with elevated evening cortisol levels and impaired quiescence of the hypothalamic-pituitary-adrenal axis.[13]

Sleep Staging

In 1968, a panel of experts led by Rechtschaffen and Kales established guidelines for scoring sleep in healthy adult humans. This coding process delineated 5 sleep stages: 1 REM stage and 4 NREM stages, each defined by a set of co-occurring physiological variables. In 2004, the American Academy of Sleep Medicine (AASM) initiated a revision of the sleep scoring guidelines, incorporating criteria for scoring arousals, respiratory events, sleep-related movement disorders, and cardiac events.[14] 

To perform sleep staging, polysomnography with an electroencephalogram (EEG) is necessary, in accordance with the AASM's standardized guidelines.[15] The typical technical configuration for sleep staging involves EEG electrodes placed at frontal (F3, F4), central (C3, C4), and occipital (O1, O2) sites, referenced to the opposite mastoid (M1, M2). An electrooculogram is used to monitor eye movements, helping differentiate between wakefulness, N1, and REM sleep.

Electromyogram of the chin is used to assess muscle tone, which is crucial for detecting REM sleep atonia. Sleep is evaluated in 30-second intervals according to AASM standards, with each interval classified by the predominant stage that occupies more than 50% of that interval. The AASM scoring manual outlines specific criteria for identifying wakefulness, N1, N2, N3, and REM sleep, based on distinct waveforms such as alpha rhythm, theta activity, sleep spindles, K-complexes, delta waves, and rapid eye movements, as outlined in Table 4.[16] 

These sleep stages are characterized by EEG frequency and amplitude, as well as muscle tone and eye movements. During the brain's transition to the early stage of sleep (see Image. Polysomnogram of Stage N1 Non–Rapid Eye Movement Sleep and Image. Electroencephalogram Transition From Wakefulness to Stage N1 Nonrapid Eye Movement Sleep), there is a distinct change in wave frequency, from alpha to theta waves (see Image. Polysomnogram of Stage N2 Sleep with Periodic Limb Movements).

Table

Table 4. Sleep Staging and EEG Wave Frequency Based on the Most Recent American Academy of Sleep Medicine Recommendations.

 EEG, electroencephalography; REM, rapid eye movement

Although home sleep apnea testing can identify obstructive sleep apnea using a limited number of channels, comprehensive sleep staging and architecture analysis require an in-laboratory polysomnogram with EEG.[17] This differentiation is clinically significant when assessing disorders in which abnormalities in sleep architecture are diagnostically important, such as narcolepsy (characterized by sleep-onset REM periods), REM sleep behavior disorder, or parasomnias (see Image. Polysomnogram During Rapid Eye Movement Sleep).

Arousal Analysis

In 1992, the ASDA proposed a definition of arousal independent of the R and K staging. According to the ASDA criteria, EEG arousals appear as sudden shifts in frequency toward faster rhythms (theta, alpha, beta, but not sigma) that briefly replace the sleep-stage background. In normal subjects, the mean duration of arousals remains unchanged across the lifespan (averaging about 15 seconds throughout total sleep time); however, the increase in arousal frequency with age is considered the physiological basis of sleep fragility in older adults.[18][19][20] In conditions of disturbed sleep, arousals have been investigated, especially in sleep-related breathing disorders and in patients with insomnia. However, results from the consolidated literature indicate that arousals and related phenomena are spontaneous manifestations of physiological sleep (see Image. Polysomnogram of Stage N1 Sleep with an Arousal).[21][22][23]

Issues of Concern

Neurobiological Regulation

The sleep-wake cycle is regulated by systems that mutually inhibit one another, forming a flip-flop switch that enables swift and complete transitions between sleep and wakefulness.[24] Systems that promote wakefulness include the ascending reticular activating system, which consists of cholinergic, monoaminergic, histaminergic, and glutamatergic neurons. Orexinergic neurons are located in the lateral hypothalamus and strengthen arousal pathways.

Systems that promote sleep include the ventrolateral preoptic nucleus and the median preoptic nucleus, which contain neurons with γ-aminobutyric acid (GABA) receptors. These neurons inhibit the ascending reticular activating system. The cycling between NREM and REM sleep is controlled by the reciprocal interaction between cholinergic REM-on neurons and aminergic REM-off neurons in the brainstem.[25] The 2-process model of sleep regulation explains how sleep is organized: process S (homeostatic), in which sleep pressure accumulates during wakefulness; and process C (circadian), a roughly 24-hour rhythm regulated by the suprachiasmatic nucleus.[26]

Lifespan Changes in Sleep Architecture

Sleep patterns undergo distinct changes throughout life. During childhood and adolescence, slow-wave sleep predominates, and sleep structure remains stable. In adulthood, N3 (slow-wave sleep) gradually decreases, accompanied by increases in N1 and periods of wakefulness. Among older adults, sleep efficiency continues to decline, sleep becomes more fragmented, and total sleep duration decreases.

Disruptions in normal sleep patterns, whether due to internal or external factors, can lead to sleep-wake disturbances and adverse effects across all age groups. Sleep disorders may sometimes indicate issues in other organ systems or neuropsychiatric dysfunction. A thorough understanding of the pathophysiology of sleep disorders is essential for diagnosis and treatment. Additionally, clinicians should consider age-related variations when diagnosing these disorders, because the definition of abnormal sleep patterns varies with age. Changes in sleep architecture over time can be either physiological or pathophysiological (see Image. Sleep Architecture and Age).

Clinical Significance

Disruptions in normal sleep can lead to several clinical manifestations depending on age. Children exhibit different symptoms from adults. Instead of fatigue and daytime sleepiness, they often show behavioral concerns such as irritability, hyperactivity, and poor academic performance.[27] Common sleep disorders in children include parasomnias, affecting up to 50%, behavioral insomnia, affecting 10% to 30%, delayed sleep phase syndrome, affecting 7% to 16% of adolescents, and obstructive sleep apnea, affecting 1% to 5%. Please see StatPearls' companion reference, "Sleep Disorder," for further information. By adolescence, approximately 25% of children will have experienced at least 1 sleep disorder, with the prevalence rising to 75% among those with autism spectrum disorder, attention-deficit hyperactivity disorder (ADHD), epilepsy, or headaches.[28]

The following are key characteristics of sleep disorders in children. Behavioral insomnia arises from inappropriate sleep-onset associations, such as a child needing specific conditions like being rocked or having a parent present to fall asleep, or from inconsistent limit-setting by caregivers.[27] Parasomnias, including sleepwalking, sleep terrors, and confusional arousals, typically resolve on their own by adolescence, with only 4% persisting into adulthood. Obstructive sleep apnea is most prevalent between the ages of 2 and 8 years. Delayed sleep phase syndrome is particularly common in adolescents, characterized by a tendency to stay up late and difficulty falling asleep and waking at socially acceptable times.

Restless legs syndrome, affecting 2% to 4% of children, is notably associated with ADHD; about one-fourth of children with restless leg syndrome exhibit ADHD symptoms, and up to one-third of those with ADHD have restless leg syndrome.[29] Results from a systematic review of 252 studies involving nearly 1 million participants from 36 countries showed a high prevalence of sleep disorders in older populations, as outlined in Table 5. Among older adults, the most common sleep disorders include obstructive sleep apnea (46%), poor sleep quality (40%), insomnia (29%), and excessive daytime sleepiness (19%).[30] Please see StatPearls' companion references, "Obstructive Sleep Apnea," "Chronic Insomnia," "Idiopathic Hypersomnia," "Periodic Limb Movement Disorder," and "Pediatric Obstructive Sleep Apnea," for further information.

Table

Table 5. Sleep Disorders in Older Adults.

EMG, electromyography

Clinical Implications of an Incidental, Abnormal EEG During Sleep

In children, abnormal EEG results during sleep can include interictal epileptiform discharges, background slowing, and sleep-enhanced epileptiform activity, with interictal epileptiform discharges being the most frequently observed anomaly, appearing in about 12% of pediatric sleep studies. When unexpected EEG irregularities are identified during pediatric polysomnography (PSG), incidental interictal epileptiform discharges are found in 6.4% of children without a prior history of seizures.[33] Among those with abnormal PSG-EEG findings, 76% exhibit irregular routine EEG findings upon follow-up.[34]

Furthermore, 29% of these children, who had both abnormal PSG-EEG findings and a neurology follow-up, eventually developed seizures, with an average follow-up duration of 31 months. However, abnormal EEG findings during PSG in children without a seizure history are not a strong indicator of future epilepsy, particularly in those without preexisting neurodevelopmental disorders. Table 6 outlines different types of abnormal EEGs during sleep in children. 

Table

Table 6. Types of Abnormal Electroencephalogram Findings During Sleep.

EEG, electroencephalography; PSG, polysomnography

The AASM recommends using an expanded EEG montage during PSG to differentiate between atypical parasomnias and sleep-related epilepsy, as standard PSG montages provide limited spatial coverage. Table 7 summarizes the characteristics of parasomnia and seizure activities during sleep. 

Table

Table 7. Features Distinguishing Parasomnias From Nocturnal Seizures.

EEG, electroencephalography

EEG Abnormalities During Sleep

Benign EEG variants (normal findings that may be misinterpreted as abnormal) 

• Positive occipital sharp transients of sleep: 36.4%
• Wicket spikes: 15%
• Benign sporadic sleep spikes: 3.3%
• Rhythmic midtemporal theta of drowsiness: 2.15%
• 14-Hz and 6-Hz positive bursts: 8.3% [35]

Pathological EEG findings

• Increased delta power during NREM sleep in severe obstructive sleep apnea (correlates with apnea-hypopnea index, arousal index, oxygen desaturation) 
• Interictal epileptiform discharges (spikes, sharp waves) may indicate seizure disorder
• Diffuse slowing suggests encephalopathy or structural abnormality
• Reduced sleep spindle density is associated with cognitive impairment and Alzheimer disease [36]

Other Issues

Fragmentary myoclonus is observed during standard PSG as frequent twitches or increases in electrical muscle activity in 1 or both extremity channels (see Image. Polysomnogram With Fragmentary Myoclonus in Stage N2 Sleep). However, results from some earlier studies suggest that fragmentary myoclonus is not confined to sleep but also occurs during relaxed wakefulness.[37] Only excessive fragmentary myoclonus may be deemed pathological. The International Classification of Sleep Disorders, 2nd ed, and AASM criteria established an arbitrary threshold for diagnosing excessive fragmentary myoclonus, defined as 5 fragmentary myoclonic potentials per minute over 20 minutes.[38]

Hypnagogic hypersynchrony refers to the coordination of neurons into synchronized, high-amplitude EEG waveforms that disrupt normal brain function. The clinical significance of hypnagogic hypersynchrony is evident in epilepsy, where these patterns signal seizure onset, but hypnagogic hypersynchrony also encompasses benign sleep phenomena that might be misdiagnosed as epilepsy.[39] The clinical implications of hypersynchrony include the potential misinterpretation of hypersynchronous EEG patterns during drowsiness and sleep as epilepsy, leading to unnecessary antiseizure treatments.

However, epileptic seizure onset can be identified when hypersynchronous activity appears as high-amplitude rhythmic spikes in EEG recordings, indicating a hyperactive state that facilitates seizure spread. Hypersynchronous gamma activity is associated with arousal disorders like sleepwalking and night terrors. Focal hypersynchronous activity has been linked to developmental motor disorders and dyslexia.

In the context of anesthesia and sedation, hypersynchronous cortical states are associated with consciousness loss during propofol anesthesia. In neurodegenerative diseases, hypersynchronous network activity has been observed in Alzheimer disease models as a biomarker for network dysfunction. Pathological hypersynchrony exhibits distinct changes in frequency and morphology, whereas benign sleep-related hypersynchrony is rhythmic and short-lived.

Hypersynchrony can be generalized during sleep or focal in specific developmental deficits. Hypnagogic hypersynchrony can mimic the 3-Hz spike-wave discharges seen in primary generalized epilepsies. Clinicians should be aware of the unique EEG characteristics of sleep in childhood to reduce misdiagnosis of epilepsy.[40]

Enhancing Healthcare Team Outcomes

Normal sleep plays an important role in human life. Changes in occupational technology, workplace ergonomics, and safety and risk-reduction strategies are important for preventing injuries and mitigating the negative effects of sleep deprivation and circadian dysfunction. Adequate strategies for assessing sleep disorders and employee wellness are an occupational safety issue that requires administrative and regulatory mandates.

Teacher and school health staff participation ensures that sleep disorders and attention and learning issues are adequately evaluated in children. Furthermore, the presence of sleep disorders should prompt early referrals to sleep medicine specialists, psychiatrists, and neurologists. Early evaluation and coordinated referral pathways can reduce delays in diagnosis and treatment. Key EEG features across various sleep stages help sleep technologists score sleep stages and allow sleep specialists to accurately assess sleep disorders. Sleep disorder management is interdisciplinary, involving ear, nose, and throat specialists, pulmonologists, sleep medicine specialists, and psychiatrists who work together to help patients and their families improve behavior, cognitive function, and overall health.[41][42][43]

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Disclosure: Chetan Nayak declares no relevant financial relationships with ineligible companies.

Disclosure: Abdulghani Sankari declares no relevant financial relationships with ineligible companies.

Disclosure: Arayamparambil Anilkumar declares no relevant financial relationships with ineligible companies.