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Oman Med J. 2016 Nov;31(6):399-403.

Habitual Sleep Deprivation is Associated with 
Type 2 Diabetes: A Case-Control Study.

Author information

Department of Clinical Physiology, Sultan Qaboos University Hospital, Muscat, Oman.
Department of Biochemistry, Sultan Qaboos University Hospital, Muscat, Oman.
Department of Medicine, Sultan Qaboos University Hospital, Muscat, Oman.



It is suggested that a minimum of eight hours of sleep per night is needed for metabolism to work normally. The aim of the study was to determine the association of habitual sleep deprivation and type 2 diabetes mellitus (T2DM).


We conducted a case-control study comparing patients with T2DM with age and sex matched healthy controls. Standard sleep questionnaires (the Berlin and Epworth Sleepiness Scale) and a weekly diary were used by patients to self-report habitual sleep.


A total of 172 diabetics and 188 healthy controls were enrolled in the study. There was a significant difference between T2DM and healthy controls in nocturnal sleep duration (p = 0.033). There was a significant association between nocturnal sleep duration of fewer than six hours and T2DM (χ2 = 14.0; p = 0.0001). There was no significant difference in daytime sleepiness and daytime naps between the T2DM and control groups (p = 0.452; p = 0.581, respectively).


A nocturnal sleep duration < 6 hours is associated with T2DM.


Case-Control Studies; Diabetes Mellitus; Oman; Sleep Deprivation

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