Sleep cycles
Suggested times
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Frequently asked questions
How many sleep cycles do I need?
Most adults feel best with 5 full cycles (7.5 hours). Six cycles (9 hours) is ideal for recovery from hard training. Under 4 cycles regularly impairs performance and cognition.
Why 90 minutes per cycle?
The 90-minute figure is an average — individual cycles range from about 70 to 110 minutes. The calculator uses 90 as a reliable approximation for planning purposes.