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Supertopics:
Sleep
Segmented Sleep (Biphasic)
Cross-References:
Causes of Insomnia
Documents:
humans usually slept in two segments until recently
web
Darren Rhodes
The Conversation
2025-10-28
biphasic sleep may have been common until recently
web
Nicole Karlis
Salon
2023-03-07
being awake in the middle of the night is not so bad
web
Derek Thompson
The Atlantic
2022-01-27
waking in the night can be normal segmented sleep
web
John Swartzberg
Berkeley Wellness Letter
2015-06-30
we sleep in two segments when there's more darkness
web
Stephanie Hegarty
BBC
2012-02-22