Health

What Time Should I Wake Up or Go to Sleep?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate optimal wake and sleep times based on 90-minute sleep cycles. Wake up refreshed instead of groggy.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

Sleep Cycles Explained
How Much Sleep You Need

90-Minuten-Zyklen

Leichtschlaf → Tiefschlaf → REM = ~90 Min. Zwischen Zyklen aufwachen = frisch. Im Tiefschlaf: Traegheit. Fuer 6:30 Aufstehen: 21:00 (6 Zyklen), 22:30 (5), 0:00 (4). Plus 14 Min Einschlafzeit.

Qualitaet

7,5h (5 volle Zyklen) ist oft besser als 8h (unterbrochener 6. Zyklus). Qualitaetskiller: Bildschirm im Bett (Blaulicht), Koffein nach 14 Uhr, Alkohol.

⚡ CalcWolf Insight

The single best sleep improvement most people can make: consistent timing. Going to bed and waking up at the same time every day (including weekends) regulates your circadian rhythm more than any supplement, app, or mattress. Irregular sleep schedules are equivalent to constant mild jet lag.

Frequently asked questions

Beste Schlafenszeit fuer 6:30?▾

6 Zyklen: 20:46. 5: 22:16. 4: 23:46.

Warum nach 8h muede?▾

Im Tiefschlaf geweckt. 7,5h (5 Zyklen) kann besser sein.

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →