Most sleep calculators give everyone the same answer — 15 minutes to fall asleep, 90-minute cycles, done. This one works differently whether you own an Apple Watch or not. Use it right now by adjusting the fall-asleep slider to what you know about yourself — or pull your exact number from Health app → Browse → Sleep → Time to Fall Asleep if you wear Apple Watch to bed. Either way, you get three things: the best bedtime for your alarm, optimal wake-up times for your bedtime, and a check on whether your current alarm is landing at a natural cycle boundary or dragging you out mid-cycle.
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