How the Sleep Calculator Works
Have you ever slept for 8 hours but still woke up feeling tired? It’s likely because you woke up in the middle of a sleep cycle.
90-Minute Cycles
Your brain moves through sleep stages in ~90 minute waves. Waking up at the end of a cycle is optimal.
15-Minute Buffer
The average person takes 14-15 minutes to fall asleep. Our calculator accounts for this latency.
Sleep Inertia
Waking up during deep sleep causes "sleep inertia"—that heavy, groggy feeling.
Age Recommendations
| Age Group | Recommended Sleep |
|---|---|
| Adults (18-64) | 7 - 9 hours |
| Teenagers (14-17) | 8 - 10 hours |
| School Age (6-13) | 9 - 11 hours |
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