Evie Summers
Sleep is essential for optimal health. While the amount of sleep needed varies across age groups, the general consensus is that adults need a minimum of seven hours of sleep per night to maintain good health. Sleeping less than seven hours per night is associated with adverse health outcomes, including weight gain, obesity, diabetes, impaired immune function, increased pain, impaired performance, and a greater risk of accidents. Older adults may need slightly less sleep, and a small number of people with a rare genetic mutation can function healthily on less than 6.5 hours of sleep per night.
| Characteristics | Values |
|---|---|
| Newborns | 14-17 hours |
| Infants | 12-15 hours |
| Toddlers | 11-14 hours |
| Preschoolers | 10-13 hours |
| School-aged children | 9-11 hours |
| Teenagers | 8-10 hours |
| Adults | 7-9 hours |
| Older adults | 7-8 hours |
| Pregnant women in their first trimester | Several more hours than usual |
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What You'll Learn
Sleep recommendations by age
Sleep is essential for both mental and physical health, and the amount of sleep a person needs depends on their age.
Infants:
Newborns (0-3 months) need the most sleep, with a recommended sleep duration of 14-17 hours per day. From 4-11 months, the recommended sleep duration is 12-16 hours, including naps.
Toddlers:
For toddlers (1-2 years), the recommended sleep duration is 11-14 hours, including naps. Toddlers start to develop a more consistent sleep schedule, with longer sleep at night and fewer naps during the day.
Preschoolers:
Preschoolers (3-5 years) should get 10-13 hours of sleep, and they may still include a nap. By this age, children are expected to get most of their sleep at night, gradually dropping their afternoon napping habit.
School-Age Children:
School-age children (6-13 years) need 9-11 hours of sleep per day. Establishing a healthy bedtime routine and good "sleep hygiene" are important to ensure children get the recommended amount of sleep.
Teenagers:
Teenagers (14-17 years) are advised to get 8-10 hours of sleep per day. However, due to various demands on their time, such as schoolwork, extracurricular activities, and social life, teenagers are often sleep-deprived.
Adults:
The average adult needs 7-9 hours of sleep, although this can vary, and some people may need as few as 6 hours or as many as 10 hours.
Older Adults:
For older adults (65 and older), the recommended sleep duration is 7-8 hours per day.
It is important to note that these are general recommendations, and individual sleep needs may vary. Factors such as daily sleep habits, overall health, and environmental conditions can also influence the amount of sleep a person requires.
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Sleep quality over quantity
The amount of sleep a person needs depends on their age. Generally, infants and toddlers need the most sleep, with older adults needing the least. Here's a breakdown of the recommended sleep ranges for different age groups:
- Infants (ages 0-3 months) need 14-17 hours a day.
- Infants (ages 4-11 months) need 12-15 hours a day.
- Toddlers (ages 1-2 years) need about 11-14 hours a day.
- Preschool children (ages 3-5) need 10-13 hours a day.
- School-age children (ages 6-13) need 9-11 hours a day.
- Teenagers (ages 14-17) need about 8-10 hours each day.
- Most adults need 7 to 9 hours, although some people may need as few as 6 hours or as many as 10 hours of sleep each day.
- Older adults (ages 65 and older) need 7-8 hours of sleep each day.
While these are the general recommendations, it's important to prioritize sleep quality over quantity. Sleeping for a shorter duration but experiencing high-quality sleep can be more beneficial than sleeping for longer but having poor-quality sleep. Here are some tips to improve your sleep quality:
- Maintain a consistent wake-up time, especially on weekends.
- Limit daytime naps to 20-30 minutes, and ensure they are at least six hours before your desired bedtime.
- Engage in physical activity.
- Keep a sleep diary to track your sleep patterns and identify any issues.
- Stick to a consistent sleep schedule, even on weekends.
- Create a relaxing bedtime routine and avoid bright lights, large meals, caffeine, and alcohol before bed.
- Make your bedroom conducive to sleep by keeping it dark, quiet, and at a comfortable temperature.
- Avoid electronic screens in the bedroom, such as TVs or cell phones.
By focusing on sleep quality and implementing healthy sleep habits, you can ensure you're getting the most out of your sleep, even if it falls within the shorter duration range.
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Napping to repay sleep debt
Napping can be a double-edged sword when it comes to repaying sleep debt. While it can provide a quick boost of energy and help you feel less tired during the day, it is not a substitute for consistent, quality nighttime sleep.
If you've had a poor night's sleep, a short nap of around 10 to 20 minutes can be beneficial. This length of nap provides enough time for your body to recharge without entering deep sleep, which can leave you feeling groggy upon waking. These short naps can improve your working memory, learning ability, and mental alertness for several hours afterward.
However, napping too long or too close to bedtime can disrupt your nighttime sleep and worsen insomnia. It's best to nap earlier in the day, aiming for no later than halfway between your wake-up time and bedtime.
While napping can provide temporary relief from fatigue, it's important to prioritize consistent, quality nighttime sleep. Sleep debt accumulates over time, and it can take several days to recover from its negative effects. Maintaining a consistent sleep schedule, improving your sleep hygiene, and making sleep a priority will help you repay your sleep debt and maintain optimal health.
Additionally, it's worth noting that napping and sleeping in on weekends may not fully compensate for high rates of sleep debt. Research suggests that it can take up to four days to recover from one hour of lost sleep and up to nine days to completely eliminate sleep debt. Therefore, if you're consistently falling short of your sleep needs, focus on improving your nighttime sleep habits and routines.
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Sleep and health risks
Sleep is essential for optimal health, and not getting enough sleep can have several negative consequences. The amount of sleep a person needs depends on various factors, including their age, with infants requiring the most sleep at 14–17 hours a day, while older adults aged 65 and above need 7–8 hours of sleep. Most healthy adults require at least seven hours of sleep, with 7–9 hours being the standard recommendation for healthy young adults and adults.
Sleeping less than seven hours per night regularly is associated with adverse health outcomes and an increased risk of accidents. Sleep deprivation can negatively impact judgment and decision-making abilities, such as the risk of driving while not mentally alert. Regularly getting less than six hours of sleep increases the risk of falling asleep at the wheel, with drowsy driving accounting for a significant number of fatal crashes.
Chronic sleep deprivation can have long-term impacts on overall health and well-being. It can lead to impaired immune function, increased pain, and a higher risk of developing various conditions, including weight gain and obesity, diabetes, hypertension, heart disease, stroke, and mental health issues such as anxiety and depression.
Additionally, sleep deprivation can cause slower reaction times, feelings of depression, and higher chances of conditions like high blood pressure, a weakened immune system, stronger feelings of pain, and difficulty in problem-solving and decision-making. It can also lead to overeating and weight gain, as well as skin issues like wrinkles and dark circles under the eyes.
To maintain good sleep hygiene and reduce the risk of health complications, it is essential to prioritize sleep and aim for the recommended number of hours of sleep each night. This can be achieved by maintaining a consistent sleep schedule, creating a relaxing sleep environment, and avoiding caffeine and electronic screens before bed.
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Sleep stages and cycles
Sleep is not uniform. Instead, a typical night of sleep is made up of several rounds of the sleep cycle, which is composed of four individual stages. In a typical night, a person goes through four to six sleep cycles, with each cycle lasting about 90 minutes on average. The first sleep cycle is often the shortest, ranging from 70 to 100 minutes, while later cycles tend to be longer, falling between 90 and 120 minutes.
The four stages of sleep are determined by an analysis of brain activity during sleep, which shows distinct patterns that characterise each stage. The four stages are:
Stage 1 (N1)
Stage 1 is the lightest stage of sleep and usually lasts just one to seven minutes, comprising 5% of total sleep time. This is when a person first falls asleep. The body has not fully relaxed, though the body and brain activities start to slow with periods of brief movements. It is easy to wake someone up during this stage.
Stage 2 (N2)
Stage 2 is deeper sleep, during which the body enters a more subdued state, including a drop in temperature, relaxed muscles, and slowed breathing and heart rate. Brain waves show a new pattern, and eye movement stops. Brain activity slows, but there are short bursts of activity that help resist being woken up by external stimuli. Stage 2 can last for 10 to 25 minutes during the first sleep cycle, and each N2 stage can become longer during the night.
Stage 3 (N3)
Stage 3 is deep sleep, and it is harder to wake someone up during this phase. Muscle tone, pulse, and breathing rate decrease as the body relaxes even further. The brain activity during this period has an identifiable pattern of delta waves, so stage 3 may also be called delta sleep or slow-wave sleep (SWS). This stage is critical to restorative sleep, allowing for bodily recovery, growth, and a boost to the immune system. Even though brain activity is reduced, deep sleep contributes to insightful thinking, creativity, and memory.
REM Sleep
REM sleep is the fourth stage, during which brain activity picks up, nearing levels seen when a person is awake. The body experiences atonia, a temporary paralysis of the muscles, with the exceptions of the eyes and the muscles that control breathing. The eyes can be seen moving quickly behind closed eyelids, which is how this stage gets its name. REM sleep is believed to be essential to cognitive functions like memory, learning, and creativity. It is also when the most vivid dreams occur.
The first sleep cycle of the night is often the shortest, with later cycles getting longer. As the night goes on, REM stages get longer, especially in the second half of the night. While the first REM stage may last only a few minutes, later stages can last for around an hour.
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Frequently asked questions
The bare minimum of sleep needed to survive is 4 hours per 24-hour period. However, this is not recommended as it can lead to a decline in mental state and functioning.
The recommended amount of sleep for healthy young adults and adults is 7-9 hours per night. However, this can vary depending on age, with newborns needing 14-17 hours and older adults needing 7-8 hours.
Not getting enough sleep can have negative effects on your health, including increased risk of chronic diseases and early death. It can also impact your mood, concentration, and memory.
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