Sleep Cycle Calculator
Waking up at the right time is as important as the amount of sleep.
Note: We add 15 minutes to account for the time it takes to fall asleep.
The 90-Minute Rule
A full sleep cycle lasts about 90 minutes. Waking up during Deep Sleep (in the middle of a cycle) causes grogginess. Waking up at the end of a cycle makes you feel alert.
Sleep Quality Tips
- Keep your room at 18°C (65°F).
- No caffeine 6-8 hours before bed.
- Morning sunlight resets your clock.