How Much Sleep Do We Need?
If you've read our previous articles, The Importance of Sleep and 10 Health Benefits of Sleep, you'll already have a better understanding of why sleep is one of the foundations of good health.
The next logical question is:
How much sleep do we actually need?
Is seven hours enough? Is eight hours better? Can you sleep too little—or even too much?
The answer isn't quite as straightforward as many people think. Sleep needs vary from person to person and change throughout life. In this article we'll explore how much sleep experts recommend, explain the concept of sleep debt, and look at how to find the amount of sleep that helps you feel your best.
Is There a Perfect Amount of Sleep?
Everyone's sleep requirements are different and are influenced by factors such as age, lifestyle, activity levels and overall health. Researchers therefore agree there is no universal "magic number" that applies to everyone.
According to the National Institutes of Health, the average adult sleeps less than seven hours per night. Although some people appear to function well on as little as six hours of sleep, these individuals are the exception rather than the rule.
Research has identified a rare genetic variation that allows a very small percentage of people to perform well with relatively little sleep. For the vast majority of us, however, regularly sleeping for only six hours is unlikely to be enough to maintain optimal physical and mental wellbeing.
While many people can cope with insufficient sleep for short periods, there is a significant difference between simply getting by and consistently performing at your best. Long-term sleep deficiency has been associated with a range of physical and mental health problems, making both the quality and quantity of sleep important.
Recommended sleep duration varies with age, lifestyle and individual needs.
Although research cannot pinpoint an exact amount of sleep needed by people at different ages, the table below identifies a useful guide that most sleep experts broadly agree upon.
| Age | Recommended Amount of Sleep |
| Newborns | 16-18 hours a day |
| Preschool-aged children | 11-12 hours a day |
| School-aged children | At least 10 hours a day |
| Teens | 9-10 hours a day |
| Adults | 7-8 hours a day |
| Source: http://www.nhlbi.nih.gov/ |
There Is No Magic Number
As the table shows, different age groups require different amounts of sleep. Beyond age, however, everyone's individual sleep requirements can vary.
Researchers often describe two important concepts when discussing sleep needs:
- Basal sleep – the amount of sleep your body naturally requires for optimal health and performance.
- Sleep debt – the accumulated sleep you've lost through late nights, poor sleep habits, illness or interrupted sleep.
The easiest way to determine whether you're getting enough sleep is to pay attention to how you feel throughout the day. If you consistently wake feeling refreshed, remain alert and maintain good energy levels without relying heavily on caffeine, you've probably found your own "magic number".
Understanding Basal Sleep and Sleep Debt
Basal sleep is the amount of sleep your body needs on a regular basis to maintain good physical health, mental wellbeing and day-to-day performance.
Whenever we sleep less than our body requires, we begin to build what researchers refer to as sleep debt. Every hour of missed sleep adds to that debt until it is eventually repaid.
Some people try to compensate by taking power naps. Although a short nap may temporarily improve alertness, it cannot fully replace the restorative benefits of a full night's sleep.
The obvious question therefore becomes:
How do you repay your sleep debt?
Repaying Your Sleep Debt
Many people assume that sleeping longer at weekends is enough to recover from a week of poor sleep. While extra rest may leave you feeling better temporarily, it rarely eliminates an accumulated sleep debt completely.
Large variations between weekday and weekend sleep can also disrupt your body's natural sleep-wake rhythm, making it harder to establish consistent sleeping patterns.
Instead, aim to gradually repay your sleep debt through regular habits.
Some simple strategies include:
Aim for at least seven and a half hours of sleep each night
Make sleep a priority by allowing enough time each night for a full night's rest.Consistency is one of the most important factors.
Repay sleep debt gradually
Rather than trying to recover everything over one weekend, add an extra hour of sleep each night until you feel fully rested again.
Keep a sleep diary
Recording when you go to bed, when you wake up and how you feel during the day can help you identify patterns and understand your individual sleep needs.
Take a "sleep holiday"
If your schedule allows, spend a week or two going to bed at the same time each evening and waking naturally without an alarm. This can help you discover how much sleep your body naturally prefers.
Make sleep a priority
Just as you schedule work, exercise and family commitments, schedule enough time for sleep. Consistently sacrificing sleep to fit more into the day eventually catches up with us.
Understanding your own sleep needs and avoiding chronic sleep debt can make a noticeable difference to your energy levels, concentration and overall wellbeing.
Repaying sleep debt starts with making consistent, quality sleep a priority.
Can You Sleep Too Much?
Most discussions about sleep focus on not getting enough, but researchers have also investigated whether regularly sleeping for unusually long periods may be linked to poorer health.
In our previous article, The Importance of Sleep, we explored how chronic sleep deficiency may affect learning, concentration, reaction times and long-term health. Consistently sleeping too little has been associated with an increased risk of conditions including heart disease, high blood pressure, type 2 diabetes, obesity and depression.
Research has also identified associations between regularly sleeping for longer than nine hours and certain health conditions. However, scientists continue to investigate whether longer sleep is a cause of these conditions or simply a symptom of underlying health issues.
Overall, the strongest evidence continues to support the importance of achieving sufficient, consistent, good-quality sleep rather than focusing on a specific number of hours.
The most important message is to listen to your body. Sleeping when your body is naturally ready for sleep and maintaining a regular routine are often more beneficial than simply chasing an arbitrary target.
This isn't always easy. Shift workers, emergency responders, caregivers and others whose sleep schedules are regularly disrupted may need to pay particular attention to avoiding chronic sleep debt.
How Can You Improve Your Sleep?
We'll explore this topic in much greater detail in our next article:
In the meantime, start by paying attention to your own sleep habits. Experiment with small adjustments to your bedtime routine and notice how different amounts of sleep affect your mood, concentration, recovery and energy levels.
Finding your own "magic number" often takes a little trial and error — but it's well worth the effort.
Can Infrared Clothing Support Better Recovery?
Quality sleep is one of the most important foundations of recovery. While healthy sleep habits should always come first, many people also look for ways to make their recovery routine as comfortable as possible.
ABSOLUTE360® garments are made using infrared-responsive yarn, designed to reflect the body's own infrared energy back towards the body. Many customers enjoy wearing their garments while relaxing or sleeping because they find them comfortable throughout the night.
Although infrared clothing is not a substitute for good sleep habits, it can become part of an overall recovery routine alongside regular exercise, balanced nutrition and consistent, restorative sleep.
Final Thoughts
There is no single answer to the question, "How much sleep do we need?" While general guidelines provide a useful starting point, the right amount of sleep ultimately depends on your age, lifestyle and individual needs.
Rather than focusing solely on the number of hours you spend in bed, pay attention to how you feel during the day. Waking refreshed, staying alert and maintaining consistent energy levels are often the best indicators that you're getting the sleep your body needs.
In our next article, 10 Tips for Healthy Sleep, we'll share practical ways to improve your sleep routine and help you enjoy more consistent, restorative sleep night after night.
