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Set a Bedtime for School Wake-Ups

Work back from the school alarm to a consistent, cycle-friendly bedtime.

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Go to bed at
9:45 PM
9 hrs
6 cycles · ideal
Go to bed at
11:15 PM
7.5 hrs
5 cycles · ideal
Go to bed at
12:45 AM
6 hrs
4 cycles
Go to bed at
2:15 AM
4.5 hrs
3 cycles

💡 Sleep happens in ~90-minute cycles. Waking at the end of a cycle (rather than mid-cycle) helps you feel refreshed instead of groggy. Most adults do best with 5–6 cycles (7.5–9 hours), plus ~15 minutes to drift off.

Kids tips

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Enter the school wake-up time to find bedtimes that give a full night of complete cycles.

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School-age kids need more sleep than adults — aim for the longer (6-cycle) options.

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A consistent bedtime, even on weekends, keeps the body clock steady and mornings easier.

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