Frequently asked questions
How many hours of sleep do adults need?
7 to 9 hours. What matters most is complete cycles — typically 4 to 6 cycles of 90 minutes.
Does this replace a doctor?
No. For chronic insomnia, sleep apnea, or excessive daytime sleepiness, see a sleep specialist.
Can I share my results?
Yes — the Share button copies a URL with your time, latency, and cycle settings.
What is the best time to wake up?
It depends on your bedtime and cycle length. Use our calculator — the highest energy score marks the best slot.