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Using a Single Daytime Performance Test to Identify Most Individuals at High-Risk for Performance Impairment during Extended Wake.

St Hilaire MA, Kristal BS, Rahman SA, Sullivan JP, Quackenbush J, Duffy JF, Barger LK, Gooley JJ, Czeisler CA, Lockley SW.

Sci Rep. 2019 Nov 13;9(1):16681. doi: 10.1038/s41598-019-52930-y.


Classifying attentional vulnerability to total sleep deprivation using baseline features of Psychomotor Vigilance Test performance.

Chua EC, Sullivan JP, Duffy JF, Klerman EB, Lockley SW, Kristal BS, Czeisler CA, Gooley JJ.

Sci Rep. 2019 Aug 20;9(1):12102. doi: 10.1038/s41598-019-48280-4.


Chronotype Genetic Variant in PER2 is Associated with Intrinsic Circadian Period in Humans.

Chang AM, Duffy JF, Buxton OM, Lane JM, Aeschbach D, Anderson C, Bjonnes AC, Cain SW, Cohen DA, Frayling TM, Gooley JJ, Jones SE, Klerman EB, Lockley SW, Munch M, Rajaratnam SMW, Rueger M, Rutter MK, Santhi N, Scheuermaier K, Van Reen E, Weedon MN, Czeisler CA, Scheer FAJL, Saxena R.

Sci Rep. 2019 Mar 29;9(1):5350. doi: 10.1038/s41598-019-41712-1.


Phase Shifts to a Moderate Intensity Light Exposure in Older Adults: A Preliminary Report.

Scheuermaier KD, Lee JH, Duffy JF.

J Biol Rhythms. 2019 Feb;34(1):98-104. doi: 10.1177/0748730418818655. Epub 2018 Dec 17.


Human Resting Energy Expenditure Varies with Circadian Phase.

Zitting KM, Vujovic N, Yuan RK, Isherwood CM, Medina JE, Wang W, Buxton OM, Williams JS, Czeisler CA, Duffy JF.

Curr Biol. 2018 Nov 19;28(22):3685-3690.e3. doi: 10.1016/j.cub.2018.10.005. Epub 2018 Nov 8.


Sleep, Sleep Disorders, and Sexual Dysfunction.

Cho JW, Duffy JF.

World J Mens Health. 2019 Sep;37(3):261-275. doi: 10.5534/wjmh.180045. Epub 2018 Aug 14. Review.


Young adults are more vulnerable to chronic sleep deficiency and recurrent circadian disruption than older adults.

Zitting KM, Münch MY, Cain SW, Wang W, Wong A, Ronda JM, Aeschbach D, Czeisler CA, Duffy JF.

Sci Rep. 2018 Jul 23;8(1):11052. doi: 10.1038/s41598-018-29358-x.


Unrestricted evening use of light-emitting tablet computers delays self-selected bedtime and disrupts circadian timing and alertness.

Chinoy ED, Duffy JF, Czeisler CA.

Physiol Rep. 2018 May;6(10):e13692. doi: 10.14814/phy2.13692.


Improved cognitive morning performance in healthy older adults following blue-enriched light exposure on the previous evening.

Scheuermaier K, Münch M, Ronda JM, Duffy JF.

Behav Brain Res. 2018 Aug 1;348:267-275. doi: 10.1016/j.bbr.2018.04.021. Epub 2018 Apr 21.


Circadian Rhythm Sleep-Wake Disorders in Older Adults.

Kim JH, Duffy JF.

Sleep Med Clin. 2018 Mar;13(1):39-50. doi: 10.1016/j.jsmc.2017.09.004. Epub 2017 Nov 27. Review.


Introduction to Chronobiology.

Kuhlman SJ, Craig LM, Duffy JF.

Cold Spring Harb Perspect Biol. 2018 Sep 4;10(9). pii: a033613. doi: 10.1101/cshperspect.a033613. Review.


Soluble interleukin-13rα1: a circulating regulator of glucose.

Rachmin I, O'Meara CC, Ricci-Blair EM, Feng Y, Christensen EM, Duffy JF, Zitting KM, Czeisler CA, Pancoast JR, Cannon CP, O'Donoghue ML, Morrow DA, Lee RT.

Am J Physiol Endocrinol Metab. 2017 Dec 1;313(6):E663-E671. doi: 10.1152/ajpendo.00168.2017. Epub 2017 Sep 5.


Chronotype, Sleep Characteristics, and Musculoskeletal Disorders Among Hospital Nurses.

Zhang Y, Duffy JF, de Castillero ER, Wang K.

Workplace Health Saf. 2018 Jan;66(1):8-15. doi: 10.1177/2165079917704671. Epub 2017 Jul 21.


Do sleep disturbances mediate the association between work-family conflict and depressive symptoms among nurses? A cross-sectional study.

Zhang Y, Duffy JF, De Castillero ER.

J Psychiatr Ment Health Nurs. 2017 Oct;24(8):620-628. doi: 10.1111/jpm.12409. Epub 2017 Aug 3.


Circadian phase resetting by a single short-duration light exposure.

Rahman SA, St Hilaire MA, Chang AM, Santhi N, Duffy JF, Kronauer RE, Czeisler CA, Lockley SW, Klerman EB.

JCI Insight. 2017 Apr 6;2(7):e89494. doi: 10.1172/jci.insight.89494.


Noncontact Pressure-Based Sleep/Wake Discrimination.

Walsh L, McLoone S, Ronda J, Duffy JF, Czeisler CA.

IEEE Trans Biomed Eng. 2017 Aug;64(8):1750-1760. doi: 10.1109/TBME.2016.2621066. Epub 2016 Oct 25.


Scheduled evening sleep and enhanced lighting improve adaptation to night shift work in older adults.

Chinoy ED, Harris MP, Kim MJ, Wang W, Duffy JF.

Occup Environ Med. 2016 Dec;73(12):869-876. doi: 10.1136/oemed-2016-103712. Epub 2016 Aug 25.


Circadian gene variants influence sleep and the sleep electroencephalogram in humans.

Chang AM, Bjonnes AC, Aeschbach D, Buxton OM, Gooley JJ, Anderson C, Van Reen E, Cain SW, Czeisler CA, Duffy JF, Lockley SW, Shea SA, Scheer FA, Saxena R.

Chronobiol Int. 2016;33(5):561-73. doi: 10.3109/07420528.2016.1167078. Epub 2016 Apr 18.


Ancestral sleep.

de la Iglesia HO, Moreno C, Lowden A, Louzada F, Marqueze E, Levandovski R, Pilz LK, Valeggia C, Fernandez-Duque E, Golombek DA, Czeisler CA, Skene DJ, Duffy JF, Roenneberg T.

Curr Biol. 2016 Apr 4;26(7):R271-2. doi: 10.1016/j.cub.2016.01.071.


Impact of Common Diabetes Risk Variant in MTNR1B on Sleep, Circadian, and Melatonin Physiology.

Lane JM, Chang AM, Bjonnes AC, Aeschbach D, Anderson C, Cade BE, Cain SW, Czeisler CA, Gharib SA, Gooley JJ, Gottlieb DJ, Grant SF, Klerman EB, Lauderdale DS, Lockley SW, Munch M, Patel S, Punjabi NM, Rajaratnam SM, Rueger M, St Hilaire MA, Santhi N, Scheuermaier K, Van Reen E, Zee PC, Shea SA, Duffy JF, Buxton OM, Redline S, Scheer FA, Saxena R.

Diabetes. 2016 Jun;65(6):1741-51. doi: 10.2337/db15-0999. Epub 2016 Feb 11.


Age-Related Sleep Disruption and Reduction in the Circadian Rhythm of Urine Output: Contribution to Nocturia?

Duffy JF, Scheuermaier K, Loughlin KR.

Curr Aging Sci. 2016;9(1):34-43. Review.


Aging and Circadian Rhythms.

Duffy JF, Zitting KM, Chinoy ED.

Sleep Med Clin. 2015 Dec;10(4):423-34. doi: 10.1016/j.jsmc.2015.08.002. Epub 2015 Sep 15. Review.


A new face of sleep: The impact of post-learning sleep on recognition memory for face-name associations.

Maurer L, Zitting KM, Elliott K, Czeisler CA, Ronda JM, Duffy JF.

Neurobiol Learn Mem. 2015 Dec;126:31-8. doi: 10.1016/j.nlm.2015.10.012. Epub 2015 Nov 5.


Access to Electric Light Is Associated with Shorter Sleep Duration in a Traditionally Hunter-Gatherer Community.

de la Iglesia HO, Fernández-Duque E, Golombek DA, Lanza N, Duffy JF, Czeisler CA, Valeggia CR.

J Biol Rhythms. 2015 Aug;30(4):342-50. doi: 10.1177/0748730415590702. Epub 2015 Jun 18.


The Case for Addressing Operator Fatigue.

Duffy JF, Zitting KM, Czeisler CA.

Rev Hum Factors Ergon. 2015 Jun;10(1):29-78.


Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness.

Chang AM, Aeschbach D, Duffy JF, Czeisler CA.

Proc Natl Acad Sci U S A. 2015 Jan 27;112(4):1232-7. doi: 10.1073/pnas.1418490112. Epub 2014 Dec 22.


Circadian Rhythm Sleep Disorders.

Kim MJ, Lee JH, Duffy JF.

J Clin Outcomes Manag. 2013 Nov 1;20(11):513-528.


Sleep duration in midlife and later life in relation to cognition.

Devore EE, Grodstein F, Duffy JF, Stampfer MJ, Czeisler CA, Schernhammer ES.

J Am Geriatr Soc. 2014 Jun;62(6):1073-81. doi: 10.1111/jgs.12790. Epub 2014 May 1.


Predictors of poor sleep quality among Lebanese university students: association between evening typology, lifestyle behaviors, and sleep habits.

Kabrita CS, Hajjar-Muça TA, Duffy JF.

Nat Sci Sleep. 2014 Jan 13;6:11-8. doi: 10.2147/NSS.S55538. eCollection 2014.


Reliability and validity of the Korean version of Morningness-Eveningness Questionnaire in adults aged 20-39 years.

Lee JH, Kim SJ, Lee SY, Jang KH, Kim IS, Duffy JF.

Chronobiol Int. 2014 May;31(4):479-86. doi: 10.3109/07420528.2013.867864. Epub 2014 Jan 27.


Headache and sleep: also assess circadian rhythm sleep disorders.

Rovers J, Smits M, Duffy JF.

Headache. 2014 Jan;54(1):175-7. doi: 10.1111/head.12217. No abstract available.


Why the dim light melatonin onset (DLMO) should be measured before treatment of patients with circadian rhythm sleep disorders.

Keijzer H, Smits MG, Duffy JF, Curfs LM.

Sleep Med Rev. 2014 Aug;18(4):333-9. doi: 10.1016/j.smrv.2013.12.001. Epub 2013 Dec 10. Review.


Chronotype and breast cancer risk in a cohort of US nurses.

Ramin C, Devore EE, Pierre-Paul J, Duffy JF, Hankinson SE, Schernhammer ES.

Chronobiol Int. 2013 Nov;30(9):1181-6. doi: 10.3109/07420528.2013.809359. Epub 2013 Aug 20.


Sex difference in daily rhythms of clock gene expression in the aged human cerebral cortex.

Lim AS, Myers AJ, Yu L, Buchman AS, Duffy JF, De Jager PL, Bennett DA.

J Biol Rhythms. 2013 Apr;28(2):117-29. doi: 10.1177/0748730413478552.


A common polymorphism near PER1 and the timing of human behavioral rhythms.

Lim AS, Chang AM, Shulman JM, Raj T, Chibnik LB, Cain SW, Rothamel K, Benoist C, Myers AJ, Czeisler CA, Buchman AS, Bennett DA, Duffy JF, Saper CB, De Jager PL.

Ann Neurol. 2012 Sep;72(3):324-34. doi: 10.1002/ana.23636.


The effects of circadian phase, time awake, and imposed sleep restriction on performing complex visual tasks: evidence from comparative visual search.

Pomplun M, Silva EJ, Ronda JM, Cain SW, Münch MY, Czeisler CA, Duffy JF.

J Vis. 2012 Jul 26;12(7). pii: 14. doi: 10.1167/12.7.14.


Survival analysis indicates that age-related decline in sleep continuity occurs exclusively during NREM sleep.

Klerman EB, Wang W, Duffy JF, Dijk DJ, Czeisler CA, Kronauer RE.

Neurobiol Aging. 2013 Jan;34(1):309-18. doi: 10.1016/j.neurobiolaging.2012.05.018. Epub 2012 Jun 23.


Human responses to bright light of different durations.

Chang AM, Santhi N, St Hilaire M, Gronfier C, Bradstreet DS, Duffy JF, Lockley SW, Kronauer RE, Czeisler CA.

J Physiol. 2012 Jul 1;590(13):3103-12. doi: 10.1113/jphysiol.2011.226555. Epub 2012 Apr 23.


Adverse metabolic consequences in humans of prolonged sleep restriction combined with circadian disruption.

Buxton OM, Cain SW, O'Connor SP, Porter JH, Duffy JF, Wang W, Czeisler CA, Shea SA.

Sci Transl Med. 2012 Apr 11;4(129):129ra43. doi: 10.1126/scitranslmed.3003200.


Laboratory validation of an in-home method for assessing circadian phase using dim light melatonin onset (DLMO).

Pullman RE, Roepke SE, Duffy JF.

Sleep Med. 2012 Jun;13(6):703-6. doi: 10.1016/j.sleep.2011.11.008. Epub 2012 Mar 22.


Amplitude reduction and phase shifts of melatonin, cortisol and other circadian rhythms after a gradual advance of sleep and light exposure in humans.

Dijk DJ, Duffy JF, Silva EJ, Shanahan TL, Boivin DB, Czeisler CA.

PLoS One. 2012;7(2):e30037. doi: 10.1371/journal.pone.0030037. Epub 2012 Feb 17.


Effects on subjective and objective alertness and sleep in response to evening light exposure in older subjects.

Münch M, Scheuermaier KD, Zhang R, Dunne SP, Guzik AM, Silva EJ, Ronda JM, Duffy JF.

Behav Brain Res. 2011 Oct 31;224(2):272-8. doi: 10.1016/j.bbr.2011.05.029. Epub 2011 Jun 1.


Human diurnal preference and circadian rhythmicity are not associated with the CLOCK 3111C/T gene polymorphism.

Chang AM, Buch AM, Bradstreet DS, Klements DJ, Duffy JF.

J Biol Rhythms. 2011 Jun;26(3):276-9. doi: 10.1177/0748730411402026.


Sex difference in the near-24-hour intrinsic period of the human circadian timing system.

Duffy JF, Cain SW, Chang AM, Phillips AJ, Münch MY, Gronfier C, Wyatt JK, Dijk DJ, Wright KP Jr, Czeisler CA.

Proc Natl Acad Sci U S A. 2011 Sep 13;108 Suppl 3:15602-8. doi: 10.1073/pnas.1010666108. Epub 2011 May 2.


One night of sleep deprivation affects reaction time, but not interference or facilitation in a Stroop task.

Cain SW, Silva EJ, Chang AM, Ronda JM, Duffy JF.

Brain Cogn. 2011 Jun;76(1):37-42. doi: 10.1016/j.bandc.2011.03.005. Epub 2011 Apr 7.


Reciprocal relationship between age-related sleep disruption and urological symptoms.

Scheuermaier K, Meyers M, Surprise M, Loughlin KR, Duffy JF.

BJU Int. 2011 Mar;107(6):871-3. doi: 10.1111/j.1464-410X.2011.10121.x. No abstract available.


Periodic limb movements in sleep exhibit a circadian rhythm that is maximal in the late evening/early night.

Duffy JF, Lowe AS, Silva EJ, Winkelman JW.

Sleep Med. 2011 Jan;12(1):83-8. doi: 10.1016/j.sleep.2010.06.007. Epub 2010 Nov 18.


Differential impact of chronotype on weekday and weekend sleep timing and duration.

Roepke SE, Duffy JF.

Nat Sci Sleep. 2010 Sep 1;2010(2):213-220.


Sex differences in phase angle of entrainment and melatonin amplitude in humans.

Cain SW, Dennison CF, Zeitzer JM, Guzik AM, Khalsa SB, Santhi N, Schoen MW, Czeisler CA, Duffy JF.

J Biol Rhythms. 2010 Aug;25(4):288-96. doi: 10.1177/0748730410374943.

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