The Sleep Calculator finds the best bedtime for you based on 90-minute sleep cycles. Waking up at the end of a complete cycle makes you feel refreshed, not groggy!
| Age Group | Sleep Needed |
|---|---|
| Newborns (0-3 months) | 14-17 hours |
| School kids (6-13) | 9-11 hours |
| Teenagers (14-17) | 8-10 hours |
| Adults (18-64) | 7-9 hours |
| Seniors (65+) | 7-8 hours |
It works around 90-minute sleep cycles to suggest the best times to fall asleep or wake up, so you wake at the end of a cycle feeling more refreshed.
Waking in the middle of a deep sleep cycle leaves you groggy, while waking at the end of a cycle feels more natural and energising, which is what the calculator aims for.
Most adults need about seven to nine hours per night, which is roughly five to six full sleep cycles. The calculator helps you plan bedtimes to reach this.