Sleep Calculator: How Much Sleep Do You Need?

Sleep Calculator

This sleep calculator will help you find the best bedtime for you, by maximizing your full sleep cycles. Sleep consists of 90-minutes-long sequences, repeated throughout the night. You'll wake up feeling better if you wake up at the end of a cycle, rather than in the middle of it, so use this calculator to find out what time you should go to sleep if you want to wake up refreshed and alert. And if you are still wondering how important it is to get the right amount of sleep, check how deadly your current sleeping routine is!

The duration of each stage oscillates between 5 and 15 minutes. Early in the night, stages of deep sleep are longer than REM sleep, but this swaps round as the night progresses. People's brains usually don't go from stages 1 to 5, but rather: stages of light sleep, stages of deep sleep, REM, and then back to stages of light sleep and stages of deep sleep.

Studies have found that one-third of Americans don’t get enough sleep. Some people don’t know how much sleep they should get or simply don’t budget enough time for sleep. The sleep calculator helps put your sleep on the right track. Use the calculator to determine an optimal sleep schedule based on your unique situation, including your age and either your bedtime or wake-up time. The sleep calculator is simple to use and helps make sure that you’re giving yourself enough time for rest.

How Much Sleep Do You Need?

Based on recommendations from an expert panel commissioned by the National Sleep Foundation, most adults need 7–9 hoursbof sleep per night. People aged 65 and older should get 7–8 hours. Babies, young children, and adolescents need more sleep than adults do. Recommendations for their total daily sleep, which includes naps, is listed in the following table by age group.

Age RangeRecommended Daily Sleep
Newborn0–3 months14–17 hours
Infant4–11 months12–15 hours
Toddler1–2 years11–14 hours
Preschool3–5 years10–13 hours
School-age6–13 years9–11 hours
Teens14–17 years8–10 hours

Sleep recommendations provide an overview of how much sleep most people need, but the exact amount of sleep a specific person should get can depend on other factors, such as their overall health. A doctor is in the best position to make a detailed sleep recommendation for any individual based on their unique situation.

Why Getting Enough Sleep Matters

Sleep is critical for nearly every system of the body. Getting enough sleep each night allows your mind and body to capture sleep’s restorative benefits and avoid the consequences of sleep deprivation.

What Happens During Sleep?

From an outside perspective, all sleep may look the same, but in reality, it involves complex processes with four distinct stages that make up a sleep cycle. On a typical night, you cycle through all four sleep stages in order several times. The first three stages of the sleep cycle are collectively known as non-rapid eye movement sleep (NREM). Stages 1 and 2 are lighter sleep, with the body and mind beginning to relax and slow down. Stage 3 is deep sleep, which is believed to be vital for both physical and mental recuperation. The fourth stage of sleep is rapid eye movement (REM) sleep. In this stage, most of your body is temporarily paralyzed, but brain activity dramatically increases and your eyes rapidly move behind closed lids. The most intense dreaming happens during REM sleep, which empowers memory and complex thinking when you’re awake. In the earlier sleep cycles of the night, more time is spent in NREM sleep. In later sleep cycles, we experience more REM sleep. Researchers believe the combination of NREM and REM over the course of the night is what enables you to wake up refreshed both physically and mentally. When you don’t get enough sleep, you don’t properly progress through these sleep cycles. Without the proper balance of NREM and REM, you will not get the rest that you need, which can lead to widespread repercussions for your health and well-being.

The Consequences of Sleep Deprivation

The impacts of sleep deprivation can be felt in both the short and long term, and they include effects on physical, emotional, and cognitive health. Immediately following a night of poor sleep, you are more likely to lack energy during the day. You may have excessive daytime sleepiness that makes it hard to focus. You may doze off unexpectedly, which can be especially risky if you’re driving. Even if you don’t actually fall asleep, your reaction time is worsened, which can increase the risk of accidents. Sleep deprivation is associated with irritability and mood problems. It can drag down your thinking by worsening your memory, decision-making, and problem-solving abilities. As a result, you may suffer lower academic achievement or reduced work productivity. Lack of sleep can also hinder physical performance and impair your immune system, putting you at a higher risk of infections. Over the long-term, lack of sleep has been tied to a wide range of health problem, including weight gain and obesity, diabetes, heart disease and other cardiovascular problems, depression and anxiety, pain, and hormonal abnormalities. Studies have consistently found lack of sleep to be tied to reduced quantity and quality of life.

How To Improve Sleep and Sleep Hygiene

Improving sleep hygiene is a straightforward way to make it more likely that you get the sleep that you need every night. Enhancing sleep hygiene means revamping your habits and routines as well as your bedroom environment. Having a consistent schedule with enough time budgeted for sleep is a central part of sleep hygiene, and the sleep calculator can help you establish a bedtime and wake-up time that assure you are setting aside sufficient time for sleep. Your goal should be to keep this schedule every day, even on weekends or holidays. In addition to a stable sleep schedule, other tips to help you get enough sleep include:

  • Having a relaxing routine to get ready for bed
  • Avoiding caffeine and other stimulants in the afternoon and evening
  • Reducing consumption of alcohol, especially in the hours before bed
  • Putting away electronic devices, including cell phones and tablets, for at least 30 minutes before bedtime
  • Finding time for physical activity or exercise during the day
  • Striving for natural light exposure during daylight hours
  • Making the bedroom dark and quiet, and/or using a sleep mask and earplugs, to reduce disruptions
  • Choosing a supportive mattress along with a comfortable pillow and bedding

Finding the right recipe for sleep hygiene may involve some trial-and-error to determine exactly what works for you. Starting with the sleep calculator and incorporating other healthy sleep tips are meaningful steps toward getting the sleep that your mind and body need.


Everybody has their own internal clock and individuals have various sleep needs. Nonetheless, there are certain factors which affect how many hours of sleep you need. Through regularly using a sleep calculator to establish a fixed time can help you fix a disturbed sleep schedule. For instance, sleep quality, age, exercise, stress, environmental conditions, and pregnancy. But overall, age is the greatest factor. Below are some general guidelines from the National Sleep Foundation, recommending the amount of sleep each age group needs.

  • Newborns14 to 17 hours
  • Infants14 to 17 hours
  • Toddlers11 to 14 hours
  • Pre-Schoolers10 to 13 hours
  • School-Aged Children10 to 13 hours
  • Teenagers8 to 10 hours
  • Young Adults7 to 9 hours
  • Adults7 to 9 hours
  • Older Adults7 to 8 hours