Best time to fall asleep
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ENG
Sleep Calculator
Wake up refreshed by timing your sleep cycles. Based on science.
Calculate optimal bedtimes to wake up refreshed
Recommended Times
Understanding Sleep Cycles
3 ~4.5h Not enough — minimum recommended
4 ~6h Acceptable for some people
5 ~7.5h ✨ Ideal for most adults
6 ~9h Good for athletes or recovery
Tips for Better Sleep
- Stick to a consistent sleep schedule, even on weekends
- Avoid screens (phone, TV) 1 hour before bed — blue light suppresses melatonin
- Keep your bedroom cool (65-68°F or 18-20°C) and dark
- Avoid caffeine at least 6 hours before bedtime