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Supertopics:
Sleep

Segmented Sleep (Biphasic)

Cross-References:
Causes of Insomnia

Documents:
humans usually slept in two segments until recently
webDarren RhodesThe Conversation2025-10-28
biphasic sleep may have been common until recently
webNicole KarlisSalon2023-03-07
being awake in the middle of the night is not so bad
webDerek ThompsonThe Atlantic2022-01-27
waking in the night can be normal segmented sleep
webJohn SwartzbergBerkeley Wellness Letter2015-06-30
we sleep in two segments when there's more darkness
webStephanie HegartyBBC2012-02-22