Polyphasic & Biphasic Sleep Calculator
Pick a sleep schedule and your start time to see the exact clock times for every core sleep and nap, plus how much sleep you'd get per day. Plan a biphasic, Everyman, Dymaxion or Uberman cycle.
Polyphasic sleep schedules compared
| Schedule | Structure | Total sleep | Difficulty |
|---|---|---|---|
| Monophasic | 1 block | 8h | Standard |
| Biphasic (Siesta) | 2 blocks | 6h 30m | Recommended |
| Everyman 2 | 3 blocks | 5h 10m | Reduced |
| Everyman 3 | 4 blocks | 4h 30m | Reduced |
| Dymaxion | 4 blocks | 2h | Extreme |
| Uberman | 6 blocks | 2h | Extreme |
What is polyphasic sleep?
Polyphasic sleep is any pattern that divides your daily rest into more than two segments. Instead of one long night, you sleep in several shorter blocks — a core period plus one or more naps. People try it to free up waking hours or to feel more alert across the day.
Biphasic sleep — a night-time core plus a single daytime nap — is the gentlest and most studied version. Many cultures practise it naturally as a midday siesta. The nap calculator can help you time that nap, and the guide to sleep cycles explains why 20- and 90-minute blocks line up with light sleep and full cycles.
How to adapt to a new schedule
- Keep every sleep block at the exact same clock time daily — consistency is the whole game.
- Make your nap environment dark and quiet, and set an alarm so naps stay short.
- Expect an adaptation dip of 1–3 weeks; avoid driving or risky tasks while groggy.
- Prefer biphasic if you simply want to feel sharper — it keeps your total sleep healthy.
- Stop and return to a normal schedule if focus, mood or health decline.
Polyphasic sleep FAQ
What is polyphasic sleep?
Polyphasic sleep means breaking your sleep into several blocks across 24 hours instead of one long night (monophasic). Common patterns include biphasic (a core night plus one nap), Everyman (a shorter core plus 2–3 naps), and the extreme Uberman and Dymaxion schedules built only from short naps.
What is biphasic sleep?
Biphasic sleep splits rest into two segments — usually a 5–6 hour core at night plus a 20–90 minute nap in the early afternoon (the classic "siesta"). It is the most common and most evidence-supported form of multi-phase sleep.
Is polyphasic sleep safe?
Biphasic sleep that still totals 7–9 hours is generally fine for healthy adults. Extreme schedules like Uberman (2 hours total) and Dymaxion chronically restrict sleep and are not supported by sleep science — they can impair memory, mood, immune function and safety. Treat this tool as an educational planner, not medical advice.
How long does it take to adapt?
Most people need 1–3 weeks of strict consistency to adapt to a reduced-sleep schedule, and many never fully adapt. Keep every block at the same clock time daily, including weekends, and stop if you experience persistent grogginess, microsleeps, or impaired focus.