Biphasic Sleep: Is Sleeping in Two Phases Right for You?
Biphasic sleep, dividing daily sleep into two periods, has historical precedent and emerging scientific interest. Before artificial lighting many cultures practiced segmented nighttime sleep with quie...
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Biphasic sleep, dividing daily sleep into two periods, has historical precedent and emerging scientific interest. Before artificial lighting many cultures practiced segmented nighttime sleep with quiet wakefulness between a first and second sleep. Historian Roger Ekirch found hundreds of references in pre-industrial literature. Modern experimentally, subjects exposed to long dark periods naturally developed two sleep blocks with a quiet wakeful period between them. Modern biphasic sleep can be the siesta pattern of shorter nighttime sleep supplemented by an afternoon nap. For some people biphasic sleep may align better with natural circadian biology than the conventional eight-hour monophasic block, particularly those who experience a natural afternoon energy dip.
Historical and Biological Evidence
Roger Ekirch uncovered over 500 references to first sleep and second sleep. Thomas Wehr's experiment exposed subjects to 14-hour dark periods and within weeks their sleep naturally fragmented into two blocks with quiet wakefulness between them. During this period subjects showed elevated prolactin associated with peace and calm suggesting this wakefulness is a distinct potentially beneficial state.
Implementing Biphasic Sleep in Modern Life
For the siesta model go to bed slightly later or set your alarm slightly earlier reducing nighttime sleep to 6-6.5 hours and add a consistent afternoon nap. For the segmented model use the between-sleep period for calm activities like gentle reading by dim light. Give any new pattern at least two to three weeks before judging.
Practical Tips
Try the Siesta Model First
The most practical modern biphasic pattern is 6-6.5 hours of nighttime sleep plus a 20-90 minute afternoon nap.
If You Wake at Night Do Not Panic
If you naturally wake for 30-60 minutes in the middle of the night this may be your body's natural pattern. Use the time for gentle low-light activities.
Ensure Adequate Total Sleep Time
Biphasic only works if total sleep across both periods meets your needs.
Align with Your Schedule and Culture
Biphasic works best with flexible schedules or remote work arrangements.
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