The DOI matches its Crossref record; 17 of the 17 references it cites were found in a registry or an index.
In short photoperiods, human sleep is biphasic
Abstract
SUMMARY Results of a photoperiod experiment show that human sleep can be unconsolidated and polyphasic, like the sleep of other animals. When normal individuals were transferred from a conventional 16‐h photoperiod to an experimental 10‐h photo‐period, their sleep episodes expanded and usually divided into two symmetrical bouts, several hours in duration, with a 1–3 h waking interval between them. The durations of nocturnal melatonin secretion and of the nocturnal phase of rising sleepiness (measured in a constant routine protocol) also expanded, indicating that the timing of internal processes that control sleep and melatonin, such as circadian rhythms, had been modified by the change in photoperiod. Previous work suggests that the experimental results could be simulated with dual‐oscillators, entrained separately to dawn and dusk, or with a two‐process model, having a lowered threshold for sleep‐onset during the scotoperiod.
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“Under certain circumstances, the oscillations of E and M can become dissociated from one another. In this situation, coupling forces between the two components continue to operate and tend to draw the components into either of two metastable modes of coupling that are 180° apart17,19.”
From Bipolar mood cycles associated with lunar entrainment of a circadian rhythm (2018) · cites this paper as [19]
Citations
Cites
A functional analysis of circadian pacemakers in nocturnal rodents
Pittendrigh, C. S., & Daan, S. (1976) · Journal of Comparative Physiology A · doi:10.1007/bf01417856 · Cited by 2,129
Pittendrigh, C. S., & Daan, S. (1976) · Journal of Comparative Physiology ? A · doi:10.1007/bf01417860 · Cited by 1,636
Timing of human sleep: recovery process gated by a circadian pacemaker
Daan, S., Beersma, D. G. M., & Borbély, A. A. (1984) · American Journal of Physiology-Regulatory, Integrative and Comparative Physiology · doi:10.1152/ajpregu.1984.246.2.r161 · Cited by 1,424
Circadian Activity Pattern with Two Peaks
Aschoff, J. (1966) · Ecology · doi:10.2307/1933949 · Cited by 359
The Durations of Human Melatonin Secretion and Sleep Respond to Changes in Daylength (Photoperiod)
WEHR, T. A. (1991) · The Journal of Clinical Endocrinology & Metabolism · doi:10.1210/jcem-73-6-1276 · Cited by 320
Self-citationMammalian pineal melatonin: A clock for all seasons
Bartness, T. J., & Goldman, B. D. (1989) · Cellular and Molecular Life Sciences · doi:10.1007/bf01953051 · Cited by 312
Illnerová, H., & Vaněček, J. (1982) · Journal of Comparative Physiology A · doi:10.1007/bf00612819 · Cited by 174
Photoperiodism and Effects of Indoleamines in a Unicellular Alga, Gonyaulax polyedra
Balzer, I., & Hardeland, R. (1991) · Science · doi:10.1126/science.1876838 · Cited by 161
Sleep and Alertness: Chronobiological, Behavioral, and Medical Aspects of Napping
Guilleminault, C. (1990) · JAMA · doi:10.1001/jama.1990.03440160117048 · Cited by 108
Sleep and circadian rhythms in affective patients isolated from external time cues
Wehr, T. A., Sack, D. A., Duncan, W. C., Mendelson, W. B., Rosenthal, N. E., Gillin, J. C., & Goodwin, F. K. (1985) · Psychiatry Research · doi:10.1016/0165-1781(85)90070-8 · Cited by 85
Self-citation
Research works printed but not linked: 2
- Kronauer R. E., 1987, Temporal subdivision of the circadian cycle, Lect. Math. Life Sci., 19, 63
- Zulley J., 1988, The four‐hour sleep‐wake cycle, Sleep Res., 17, 403
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Goldman, B. D. (2001) · Journal of Biological Rhythms · doi:10.1177/074873001129001980 · Cited by 771
“Also, the duration of human sleep increases as a function of shortened day length (Wehr, 1991, 1992; Wehr et al., 1993).”
BackgroundMelatonin, sleep disturbance and cancer risk
Blask, D. E. (2008) · Sleep Medicine Reviews · doi:10.1016/j.smrv.2008.07.007 · Cited by 465
Light-at-night, circadian disruption and breast cancer: assessment of existing evidence
Stevens, R. G. (2009) · International Journal of Epidemiology · doi:10.1093/ije/dyp178 · Cited by 345
Breast cancer and circadian disruption from electric lighting in the modern world
Stevens, R. G., Brainard, G. C., Blask, D. E., Lockley, S. W., & Motta, M. E. (2013) · CA A Cancer Journal for Clinicians · doi:10.3322/caac.21218 · Cited by 332
“A requirement for a daily and lengthy episode of darkness to maintain optimal circadian health has different implications than a requirement that one must be asleep during this entire period of dark; it may be normal to have wakeful periods in the middle of a dark night.(61) Electric light exposure during the night ca…”
BackgroundSleep, circadian rhythms and health
Foster, R. G. (2020) · Interface Focus · doi:10.1098/rsfs.2019.0098 · Cited by 286
“Indeed, laboratory-based studies subsequently supported the idea that human sleep is polyphasic [45,190].”
Background
Metadata
- Authors
- WEHR, T. A.
- Affiliations
- National Institutes of Health (US)
- Corresponding author
- WEHR, THOMAS A.
- ORCID
- WEHR, THOMAS A.
- Venue
- Journal of Sleep Research
- Publisher
- Wiley
- Published
- 1992-06
- Volume
- 1
- Issue
- 2
- Pages
- 103-107
- ISSN
- 0962-1105 (ISSN-L)
- 1365-2869
- OpenAlex
- W1968064632
- Cited by
- 115
- References
- 17
- Citations by year
- 2026: 5 · 2025: 6 · 2024: 6 · 2023: 5 · 2022: 6 · 2021: 7 · 2020: 7 · 2019: 5 · 2018: 10 · 2017: 4 · 2016: 6 · 2015: 8 · 2014: 7 · 2013: 7 · 2012: 1
- FWCI
- 1.31
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Sleep Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Keywords
- polyphasic sleep, short-day photoperiod, sleep consolidation, circadian rhythm, melatonin secretion, sleepiness, constant routine, two-process model
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