Human ancestors naturally practiced segmented or biphasic sleep
the verdict
SUPPORTED
the evidence backs this
confidence 77/100
Historical and anthropological sources indicate that human ancestors and pre-industrial populations naturally practiced segmented or biphasic sleep before industrialization led to the widespread adoption of continuous monophasic sleep.
Evidence for · 3
Could the Historical Transition from Segmented to Monophasic Sleep Explain the Modern Insurgence of Alzheimer’s Disease and Related Dementias?
2024 · cited by 1
Discusses the historical transition from segmented to monophasic sleep as a part of human behavioral changes.
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More for · 2
Biphasic sleep and human health: A theoretical paradigm for personalized sleep.
2025 · cited by 1
Explores historical texts and research indicating that biphasic sleep is a natural form of sleep organization across the 24-hour cycle.
Reflections on ‘Have we lost sleep?’
2024 · cited by 1
Reasserts the historical predominance of segmented sleep in pre-modern Western populations prior to modern industrial shifts.