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Sleep Calculator

Sleep Calculator



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Our sleep calculator helps you to schedule your sleep so that you awake refreshed in the morning. This tool will let you know how many sleep cycles you need to complete between your bedtime and awake time. Use it and stay energized every morning!

What Time Should I Go To Bed?

To exactly know your bedtime as per your schedule, enter your wake time in the sleep time calculator. It will instantly suggest different bedtimes along with the number of sleep cycles you will attain. You must assure yourself whether the sleep cycles you need to complete are getting covered within wake time and bedtime.

The latest research conducted by 88,000 Europeans has revealed that 10:00 PM is considered an ideal bedtime for most people.

What Time Should I Wake Up?

The case is the same as at bedtime! If you go to bed regularly same time, then just enter it in our sleepy time calculator. It will tell you when to wake up while suggesting different wake up times.

It is very important for you to complete recommended sleep cycles until your wake up time. Make sure a minimum of 4 sleep cycles between your bedtime and wake up time.

How Much Sleep Do I Need?

The number of hours is not the same for every other person belonging to a different life stage. Where an adult needs to sleep for 7 to 9 hours daily, children or newbies need more time to sleep. Look at the following table to check how many hours you should sleep daily:

Life Stage Age Range Recommended Sleep Hours
Infant 4–12 months 12-16 hours (including naps)
Toddler 1–2 years 11-14 hours (including naps)
Preschool 3–5 years 10-13 hours (including naps)
School-age 6-12 years 9-12 hours
Teens 13-18 years 8-10 hours
Adult 18 years and older 7 or more hours

However, the following table gives you an idea about different wake up and sleep timings corresponding to different sleep cycles:

Wake-Up Time Bedtime:
7.5 hours of sleep
(5 cycles)
9 hours of sleep
(6 cycles)
4 a.m. 8:15 p.m.

6:45 p.m.

4:15 a.m. 8:30 p.m. 7 p.m.
4:30 a.m. 8:45 p.m. 7:15 p.m.
4:45 a.m. 9 p.m. 7:30 p.m.
5 a.m. 9:15 p.m. 7:45 p.m.
5:15 a.m. 9:30 p.m. 8 p.m.
5:30 a.m. 9:45 p.m. 8:15 p.m.
5:45 a.m. 10 p.m. 8:30 p.m.
6 a.m. 10:15 p.m. 8:45 p.m.
6:15 a.m. 10:30 p.m. 9 p.m.
6:30 a.m. 10:45 p.m. 9:15 p.m.
6:45 a.m. 11 p.m. 9:30 p.m.
7 a.m. 11:15 p.m. 9:45 p.m.
7:15 a.m. 11:30 p.m. 10 p.m.
7:30 a.m. 11:45 p.m. 10:15 p.m.
7:45 a.m. 12 p.m. 10:30 p.m.
8 a.m. 12:15 a.m. 10:45 p.m.
8:15 a.m. 12:30 a.m. 11 p.m.
8:30 a.m. 12:45 a.m. 11:15 p.m.
8:45 a.m. 1 a.m. 11:30 p.m.
9 a.m. 1:15 a.m. 11:45 p.m.

How To Use Sleep Calculator?

Using our sleep cycle calculator is quite easy and fast! It involves the following steps to go by and get sleep or wake up times in moments.


  • Select whether you know your “Bedtime” or “Wake Up Time
  • Set the clock time below and
  • Tap calculate


  • Suggested bedtimes or wake up times for a healthy sleep schedule


What Is The Length of a Normal Sleep Cycle?

For an adult normal individual, one sleep cycle consists of 90-120 minutes of sleep. Our sleep cycle calculator also considers the same cycle range to suggest you better bedtime and wake time.

How Does Your Sleep Cycle Works?

NREM stands for Non-Rapid Eye Movement Sleep and involves the first 3 of the total 4 sleep cycles. In the first 2 cycles, the brain and body gradually slow down. In 3rd phase, you run into a deep sleep.

REM stands for Rapid Eye Movement Sleep in which your body is paralyzed temporarily. In this last sleep cycle, the activity of the brain increases, and your eyes move all around behind the lids. It mostly happens near to wake up time. You can also calculate your wake up time by entering your bedtime in the REM sleep calculator and judging if any such issue happens to you.

Is It Normal To Still Feel Tired After Sleeping For 8 Hours?

Yes of course! As we mentioned earlier, everyone has different sleep cycle lengths. So you need to optimize your sleep to stay energized after you wake up.


From the source Wikipedia: Sleep cycle, Characteristics, Length, Awakening

Other languages: Calculadora De Sueño, حاسبة النوم, Calculateur De Sommeil, Schlafrechner, Calcolo Del Sonno, 睡眠 時間 計算, 수면시간 계산, Kalkulator Snu, Calculadora Do Sono, Калькулятор Сна, Uyku Hesaplama, Tính Thời Gian Ngủ.