📖 How to Use
Select the time you need to wake up in the morning. This tool calculates the best times to go to bed based on 90-minute sleep cycles. Waking up at the end of a cycle ensures you feel fresh instead of groggy.
❓ Frequently Asked Questions
What is a sleep cycle? +
A typical sleep cycle lasts about 90 minutes, moving through light, deep, and REM sleep. An average adult needs 5-6 cycles per night.
Why do I feel tired after 8 hours? +
If you wake up in the middle of a deep sleep cycle (even after 8 hours), you may experience "sleep inertia," making you feel exhausted.
Does it count falling asleep time? +
Yes, this calculator adds a 14-minute buffer, which is the average time it takes for a healthy person to fall asleep.
How many cycles are ideal? +
5 cycles (7.5 hours) or 6 cycles (9 hours) are considered ideal for most adults to function at their best.
Can I sleep too much? +
Yes, oversleeping can also disrupt your natural biological clock and lead to headaches or lethargy.
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