Schlafrechner

Berechnen Sie optimale Schlaf- und Aufwachzeiten basierend auf Ihren Schlafzyklen. Kostenlos, schnell und vollständig im Browser nutzbar, ohne Anmeldung.

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Sleep Cycle Calculator

Find the optimal bedtime or wake time based on 90-minute sleep cycles.

I want to wake up at...
I plan to sleep at...

Wake Up Time

Assumes ~15 minutes to fall asleep. Each sleep cycle is 90 minutes.

9:45 PM
Bedtime
6 cycles
9.0h sleep
Recommended

(Recommended)

11:15 PM
Bedtime
5 cycles
7.5h sleep

(Good)

12:45 AM
Bedtime
4 cycles
6.0h sleep

(Minimum)

2:15 AM
Bedtime
3 cycles
4.5h sleep

(Nap only)

The Sleep Cycle

N1 (Light Sleep)
5–10 min
Transition to sleep, easily woken
N2 (Light Sleep)
20 min
Heart rate slows, body temperature drops
N3 (Deep Sleep)
20–40 min
Most restorative, memory consolidation
REM (Rapid Eye Movement)
10–60 min (increases each cycle)
Dreaming, emotional processing, creativity, learning

Recommended Sleep by Age

Newborn (0–3 months)14–17 hours
Infant (4–11 months)12–15 hours
Toddler (1–2 years)11–14 hours
Preschool (3–5 years)10–13 hours
School-age (6–13 years)9–11 hours
Teen (14–17 years)8–10 hours
Young Adult (18–25 years)7–9 hours
Adult (26–64 years)7–9 hours
Older Adult (65+ years)7–8 hours

Sleep Hygiene Tips

  • 1.Keep a consistent sleep schedule, even on weekends.
  • 2.Avoid screens (blue light) 1 hour before bed.
  • 3.Keep your room cool (65–68°F / 18–20°C).
  • 4.Avoid caffeine after 2 PM.
  • 5.Exercise regularly, but not within 2 hours of bedtime.
  • 6.Limit alcohol — it disrupts REM sleep.
  • 7.Use your bed only for sleep and intimacy.

Über Schlafrechner

Schlafrechner ist ein kostenloses, browserbasiertes Tool aus unserer Gesundheit & Fitness-Sammlung. Alles läuft lokal auf deinem Gerät — keine Uploads, keine Anmeldung, und deine Daten bleiben privat.

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