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	chart link Legend Sleep ; Dark period ; Flexible sleep window ;
Total sleep	7 hours
Proposed by	None, used by humans throughout history.
Difficulty	Moderate
Specification	2 long cores at night aligned to SWS and REM peaks respectively.

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Segmented
chart link Legend Sleep Dark period Flexible sleep window
Total sleep	7 hours
Proposed by	None, used by humans throughout history.
Difficulty	Moderate
Specification	2 long cores at night aligned to SWS and REM peaks respectively.