How Many Hours Should An Adult Sleep?

According to the National Sleep Foundation, adults aged between 18-64 should get seven to nine hours of sleep each night. Seniors, those aged 65 and above, require slightly less sleep, with seven to eight hours estimated to be adequate. However, this is merely a general recommendation, and actual sleep needs may vary from one person to another, depending on several factors that we will delve into in this article.

Understanding Sleep

Sleep is not merely a period of inactivity or downtime. Instead, it is a vital physiological function that facilitates several key processes in our body. During sleep, our body restores and rejuvenates itself, healing from the wear and tear suffered during the day’s activities. Significant bodily processes like muscle growth, tissue repair, and cell regeneration take place during our sleep cycles.

Moreover, sleep also plays a crucial role in maintaining our mental well-being. While we sleep, our brain processes the information absorbed during the day, forming new memory pathways. Prolonged sleep deprivation can lead to cognitive difficulties, lowering our ability to concentrate, make decisions, or even learn new things.

The Stages of Sleep

There are two primary types of sleep that humans experience: Rapid Eye Movement (REM) and Non-REM sleep.

The first of these, Non-REM sleep is further divided into three stages. The first stage is a short, light sleep that we experience just as we begin to drift off. The second stage is where our heart rate and breathing stabilize, and our body temperature drops slightly. The third stage, often referred to as “deep sleep,” is the point at which significant restorative processes occur within the body.

REM sleep, where our eyes make rapid movements despite being closed, typically occurs around 90 minutes after we fall asleep. This stage is characterized by the increase in brain activity, and it’s during this period that most dreaming occurs.

Each of these stages plays a critical role in ensuring we wake up feeling refreshed and rejuvenated. However, the duration of these stages can vary significantly between individuals, which is why the recommended amount of sleep can differ.

The Importance of Adequate Sleep

Getting the right amount of sleep each night is not only about preventing fatigue or boosting mood. Sleep has far more integral roles to our overall health and wellness.

Physical Health

A lack of sleep can have dire consequences on one’s physical health. Insufficient sleep has been linked with several chronic disorders, such as diabetes, heart disease, obesity, and even certain types of cancer.

Mental Health

Sleep also plays an important part in our mental and emotional health. Insufficient sleep can fuel stress, anxiety, or depression. More so, sleep deprivation can heighten the risk of developing mood disorders.

Cognitive Function

Lack of sleep impairs several cognitive functions including concentration, problem-solving skills, and memory. Over time, poor sleep can contribute to the symptoms of severe mental health problems.

Factors Influencing Sleep Needs

To determine how much sleep one needs, various factors need to be taken into account. These factors can include the individual’s age, lifestyle, health status, and overall physical activity.


As noted earlier, adults generally require seven to nine hours of sleep. However, this is merely an average estimate, and individual requirements can vary. Older adults might need slightly less sleep, while younger adults and teenagers often require more.

Lifestyle and Health

Lifestyle and health status also significantly influence sleep needs. For example, pregnant women often require more sleep due to the physiological changes their bodies are undergoing. Similarly, individuals with certain medical conditions such as chronic pain or illness may need more sleep than average.

Physical Activity

Physical activity is another essential determinant of sleep needs. People who are physically active will generally require more sleep to allow their bodies to recover.

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Finishing Thoughts

Sleep is a vital need for everyone—regardless of age, occupation, or health status. While the general guideline is for adults to aim for between seven to nine hours of sleep each night, each individual has unique sleep requirements. Understanding the importance of sleep and what influences sleep needs is a step towards maintaining good sleep habits and, consequently, improving one’s overall quality of life. After all, a good night’s sleep is one of the key cornerstones of a healthy, balanced lifestyle.


  • Aiden Lawrence

    I'm Aiden Lawrence, a certified Sleep Science Coach and senior editor of GoodSleepHub, proud parent of two amazing kids, and a pet lover with a cat and a dog. Join me as we explore the world of sweet dreams and comfy pillows. Let's make bedtime the highlight of your day!

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