🛠️ New Tool
Sleep Calculator
Find your perfect bedtime or wake-up time using 90-minute sleep cycles. Wake up refreshed.
🌙 Best bedtimes
To wake up at — feeling refreshed, head to bed at one of these times:
Cycles
90 min
Average to fall asleep
15 min
📌 5 Tips for Better Sleep
- ✓ Stick to 90-min cycles: A full sleep cycle is ~90 minutes. Waking mid-cycle leaves you groggy.
- ✓ Give yourself buffer time: Plan 15 min to fall asleep. Going to bed earlier won't help if you can't drift off.
- ✓ 5–6 cycles is the sweet spot: 7.5 hours (5 cycles) is usually more refreshing than 8 hours (5.3 cycles).
- ✓ Avoid screens 1 hour before bed: Blue light suppresses melatonin, the sleep hormone.
- ✓ Keep a consistent schedule: Going to bed and waking at the same time daily beats weekend catch-up sleep.
Related Tools
Once you've dialed in your sleep window, these five tools help you apply the same precision to the rest of your day — from calorie targets to habit tracking.
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- BMI Calculator: Check your body mass index using height and weight
- Habit Tracker: Build streaks for sleep, exercise, hydration, and reading
- Simple vs Compound Interest Calculator: See how compounding grows savings over time
- 50/30/20 Budget Calculator: Allocate needs, wants, and savings from your take-home pay
Disclaimer: This calculator provides general estimates based on average 90-minute sleep cycles. Individual sleep needs vary. Not medical advice — consult a healthcare provider for chronic sleep issues.