😴 නින්ද චක්‍රය කැල්ක්යුලේටරය

මෙම කැල්ක්යුලේටරය ගැන

A sleep cycle calculator suggests bedtimes or wake-up times aligned to 90-minute sleep cycles, so you wake between cycles rather than in the middle of deep sleep and feel more refreshed. It counts back or forward in 90-minute blocks and adds the time it takes to fall asleep. Most adults do best on five to six complete cycles (7.5–9 hours).

Say you must wake at 07:00 and take about 15 minutes to drop off. Six cycles need 6 × 90 = 540 minutes of sleep plus 15 to fall asleep, so you should be in bed by 21:45; five cycles push that to 23:15. Switch to bedtime mode and it counts forward instead, suggesting wake times that land at the end of a cycle rather than mid-cycle.

Use it to pick a bedtime that leaves you waking during light sleep, when you tend to feel less groggy. The highlighted five- and six-cycle options match the 7.5–9 hours most adults need, while the shorter three- and four-cycle rows suit a nap or an unavoidably late night. Cycle length averages 90 minutes but varies between people and across the night, so treat the times as a helpful guide.