Last updated: November 1, 2026.
No medical advice
The content and calculator on this website are for general informational and planning purposes. They do not constitute medical advice, diagnosis or treatment and do not create a clinician-patient relationship.
When to seek professional help
Consider speaking with a qualified healthcare professional if you experience any of the following:
- Persistent difficulty falling asleep or staying asleep.
- Severe daytime sleepiness or sleepiness while driving.
- Loud snoring with pauses in breathing or gasping during sleep.
- Unusual movements, violent behavior or confusion during sleep.
- Sleep problems that affect your safety, mood, work or relationships.
- Symptoms that started or worsened with a new medication or health condition.
Emergencies
This website is not monitored for emergencies. If you or someone else is in immediate danger, contact local emergency services.
Individual variation
Sleep needs and sleep timing vary. The calculator's assumptions about latency and cycle length are estimates. A result that looks suitable does not guarantee that it is appropriate for your health situation.