References
- American Academy of Sleep Medicine. 2014. International classification of sleep disorders. Coding. 3rd ed. ed. Darien, IL: American Academy of Sleep Medicine.
- American Psychiatric Association. 1994. Diagnostic and statistical manual of mental disorders. 4 ed. ed. Washington, DC: American Psychiatric Publishing.
- American Psychiatric Association. 2013. Diagnostic and statistical manual of mental disorders. 5 ed. ed. Washington, DC: American Psychiatric Publishing.
- Barre V, Petter-Rousseaux A. 1988. Seasonal variations in sleep-wake cycle in microcebus murinus. Primates. 29:53–64. doi:https://doi.org/10.1007/BF02380849
- Friborg O, Bjorvatn B, Amponsah B, Pallesen S. 2012. Associations between seasonal variations in day length (photoperiod), sleep timing, sleep quality and mood: a comparison between Ghana (5 degrees) and Norway (69 degrees). J Sleep Res. 21:176–184. doi:https://doi.org/10.1111/j.1365-2869.2011.00982.x
- Friborg O, Rosenvinge JH, Wynn R, Gradisar M. 2014. Sleep timing, chronotype, mood, and behavior at an Arctic latitude (69 degrees N). Sleep Med. 15:798–807. doi:https://doi.org/10.1016/j.sleep.2014.03.014
- Friborg O, Sundby J, Rognmo K, Rosenvinge JH, Bergvik S. 2018. No seasonality in cognitive performance among adolescents at a subarctic latitude (69degreeN). Appl Cogn Psychol. 32:217–224. doi:https://doi.org/10.1002/acp.3397
- Hashizaki M, Nakajima H, Shiga T, Tsutsumi M, Kume K. 2018. A longitudinal large-scale objective sleep data analysis revealed a seasonal sleep variation in the Japanese population. Chronobiol Int. 35:933–945. doi:https://doi.org/10.1080/07420528.2018.1443118
- Husby R, Lingjaerde O. 1990. Prevalence of reported sleeplessness in northern Norway in relation to sex, age and season. Acta Psychiatr Scand. 81:542–547. doi:https://doi.org/10.1111/j.1600-0447.1990.tb05009.x
- Itani O, Kaneita Y, Munezawa T, Mishima K, Jike M, Nakagome S, Tokiya M, Ohida T. 2016. Nationwide epidemiological study of insomnia in Japan. Sleep Med. 25:130–138. doi:https://doi.org/10.1016/j.sleep.2016.05.013
- Jacobsen BK, Eggen AE, Mathiesen EB, Wilsgaard T, Njolstad I. 2012. Cohort profile: the Tromso Study. Int J Epidemiol. 41:961–967. doi:https://doi.org/10.1093/ije/dyr049
- Johnsen MT, Wynn R, Allebrandt K, Bratlid T. 2013. Lack of major seasonal variations in self reported sleep-wake rhythms and chronotypes among middle aged and older people at 69 degrees North: the Tromso Study. Sleep Med. 14:140–148. doi:https://doi.org/10.1016/j.sleep.2012.10.014
- Johnsen MT, Wynn R, Bratlid T. 2012. Is there a negative impact of winter on mental distress and sleeping problems in the subarctic: the Tromso Study. BMC Psychiatry. 12:225. doi:https://doi.org/10.1186/1471-244X-12-225
- Kasper S, Wehr TA, Bartko JJ, Gaist PA, Rosenthal NE. 1989. Epidemiological findings of seasonal changes in mood and behavior. A telephone survey of Montgomery County, Maryland. Arch Gen Psychiatry. 46:823–833. doi:https://doi.org/10.1001/archpsyc.1989.01810090065010
- Lowden A, Lemos NAM, BSB G, Öztürk G, Louzada F, Pedrazzoli M, Moreno CR. 2019. Delayed sleep in winter related to natural daylight exposure among arctic day workers. Clocks Sleep. 1. doi:https://doi.org/10.3390/clockssleep1010010
- Martin-Olalla JM. 2019. The long term impact of daylight saving time regulations in daily life at several circles of latitude. Sci Rep-Uk. 9. doi:https://doi.org/10.1038/s41598-019-54990-6
- Ohayon MM, Partinen M. 2002. Insomnia and global sleep dissatisfaction in Finland. J Sleep Res. 11:339–346. doi:https://doi.org/10.1046/j.1365-2869.2002.00317.x
- Orne MT. 1962. On the social psychology of the psychological experiment: with particular reference to demand characteristics and their implications. Am Psychol. 17. doi:https://doi.org/10.1037/h0043424
- Overland S, Woicik W, Sikora L, Whittaker K, Heli H, Skjelkvale FS, Sivertsen B, Colman I. 2019. Seasonality and symptoms of depression: A systematic review of the literature. Epidemiol Psychiatr Sci. 29:e31. doi:https://doi.org/10.1017/S2045796019000209
- Pallesen S, Bjorvatn B, Nordhus IH, Sivertsen B, Hjornevik M, Morin CM. 2008. A new scale for measuring insomnia: the Bergen Insomnia Scale. Percept Mot Skills. 107:691–706. doi:https://doi.org/10.2466/PMS.107.7.691-706
- Pallesen S, Nordhus IH, Nielsen GH, Havik OE, Kvale G, Johnsen BH, Skjotskift S. 2001. Prevalence of insomnia in the adult Norwegian population. Sleep. 24:771–779. doi:https://doi.org/10.1093/sleep/24.7.771
- Portaluppi F, Smolensky MH, Touitou Y. 2010. Ethics and methods for biological rhythm research on animals and human beings. Chronobiol Int. 27:1911–1929. doi:https://doi.org/10.3109/07420528.2010.516381
- Rosenthal N, Bradt G, Wehr T. 1987. Seasonal Pattern Assessment Questionnaire (SPAQ). Washington, DC: National Institute of Mental Health.
- Rosenthal NE, Sack DA, Gillin JC, Lewy AJ, Goodwin FK, Davenport Y, Mueller PS, Newsome DA, Wehr TA. 1984. Seasonal affective disorder. A description of the syndrome and preliminary findings with light therapy. Arch Gen Psychiatry. 41:72–80. doi:https://doi.org/10.1001/archpsyc.1984.01790120076010
- Shephard RJ, Aoyagi Y. 2009. Seasonal variations in physical activity and implications for human health. Eur J Appl Physiol. 107:251–271. doi:https://doi.org/10.1007/s00421-009-1127-1
- Sivertsen B, Overland S, Krokstad S, Mykletun A. 2011. Seasonal variations in sleep problems at latitude 63 degrees −65 degrees in Norway: the Nord-Trondelag Health Study, 1995-1997. Am J Epidemiol. 174:147–153. doi:https://doi.org/10.1093/aje/kwr052
- Sivertsen B, Pallesen S, Friborg O, Nilsen KB, Bakke OK, Goll JB, Hopstock LA. 2020. Sleep patterns and insomnia in a large population-based study of middle-aged and older adults: the Tromso study 2015-2016. J Sleep Res. e13095. doi:https://doi.org/10.1111/jsr.13095
- Suzuki M, Taniguchi T, Furihata R, Yoshita K, Arai Y, Yoshiike N, Uchiyama M. 2019. Seasonal changes in sleep duration and sleep problems: A prospective study in Japanese community residents. Plos One. 14:e0215345. doi:https://doi.org/10.1371/journal.pone.0215345
- Thorleifsdottir B, Bjornsson JK, Benediktsdottir B, Gislason T, Kristbjarnarson H. 2002. Sleep and sleep habits from childhood to young adulthood over a 10-year period. J Psychosom Res. 53:529–537. doi:https://doi.org/10.1016/S0022-3999(02)00444-0
- Volkov J, Rohan KJ, Yousufi SM, Nguyen MC, Jackson MA, Thrower CM, Postolache TT. 2007. Seasonal changes in sleep duration in African American and African college students living in Washington, D.C. Sci World J. 7:880–887. doi:https://doi.org/10.1100/tsw.2007.128
- Weinberger DM, Krause TG, Molbak K, Cliff A, Briem H, Viboud C, Gottfredsson M. 2012. Influenza epidemics in Iceland over 9 decades: changes in timing and synchrony with the United States and Europe. Am J Epidemiol. 176:649–655. doi:https://doi.org/10.1093/aje/kws140