Recovery · Free Calculator
Sleep Cycle Calculator
Sleep runs in 90 minute cycles. Wake mid cycle and you feel wrecked. Pick when you need to be up. We'll tell you when to shut it down.
To wake fresh at
4:00 AM
go to bed at one of these times
6:45 PM
9 hours · 6 cycles
8:15 PM
7.5 hours · 5 cycles
9:45 PM
6 hours · 4 cycles
Waking at 4:00 AM gives you 1,095 extra hours a year compared to the 7 AM crowd. That's 46 extra days of life awake. Use them.