😴 Health & Body

Sleep Cycle Calculator

Wake up refreshed by timing your alarm to your natural sleep cycles.

How Sleep Cycles Work

Your brain moves through sleep cycles roughly every 90 minutes, including light sleep, deep sleep, and REM. Waking mid-cycle leaves you groggy; waking between cycles feels natural.

How Many Cycles Do You Need?

Most adults need 5-6 complete cycles (7.5-9 hours). Fewer than 4 cycles consistently affects mood, focus, and metabolism.

Tips for Better Sleep

Keep wake time consistent, even on weekends
Avoid screens 30-60 minutes before bed
Keep your room cool (16-19C is optimal)
The average person takes 14 minutes to fall asleep

Sleep Cycle Calculator

Find the best time to wake up or go to bed.

I want to:

I plan to fall asleep at:

I need to wake up at:

Minutes to fall asleep:

Help keep these free tools coming

These tools are free to use. If they’ve helped you, a small donation helps keep new calculators, date tools, improvements, and updates coming.

Donate Here