// FREE TOOL · FROM VIVE
Wake up sharp, not groggy.
Plan your bedtime or wake time around complete 90-minute sleep cycles.
Sleep cycles run ~90 min. Waking between cycles feels less groggy than waking mid-cycle. Recommended for your age group: 7–9 hours.
9:45 PM
6 cycles · 9h · ★ In recommended range
11:15 PM
5 cycles · 7.5h · ★ In recommended range
12:45 AM
4 cycles · 6h
2:15 AM
3 cycles · 4.5h
// FAQ
Good to know
Why 90-minute cycles?+
Sleep moves through light, deep, and REM stages in roughly 90-minute cycles. Waking near the end of a cycle — rather than in the middle of deep sleep — tends to feel less groggy.
How much sleep do I really need?+
Most adults need 7–9 hours; teens need more, older adults slightly less. Consistency matters as much as the total — try to keep a similar schedule most nights.
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