Ashwin Lewis
Sleep efficiency is a measure of the quality of your sleep. It is calculated as a percentage of the time spent asleep while in bed. A normal sleep efficiency score is 85% or higher, with most young, healthy adults displaying scores above 90%. A low sleep efficiency score could be caused by long sleep latency (the time it takes to fall asleep) and sleep fragmentation (intermittent waking throughout the night). There are many factors that can impact your sleep efficiency, including lifestyle factors such as diet, exercise, and sleep hygiene. Improving your sleep efficiency can be beneficial for your overall health and well-being.
| Characteristics | Values |
|---|---|
| Definition | The ratio between the time a person spends asleep and the total time dedicated to sleep (including time spent trying to fall asleep or fall back asleep) |
| Calculation | Total sleep time (in minutes) / total time in bed (in minutes) x 100 |
| Normal sleep efficiency | 85% or higher; most young healthy adults display SE above 90% |
| Low sleep efficiency causes | Long sleep latency (long time to fall asleep), sleep fragmentation (frequent awakenings), sleep debt, poor sleep hygiene, sleep disorders, socio-economic factors, loneliness |
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Sleep debt
Sleep efficiency (SE) is the ratio between the time a person spends asleep and the total time dedicated to trying to fall asleep. It is given as a percentage. An SE of 80% or more is considered normal, with most young, healthy adults displaying an SE above 90%.
Low sleep efficiency indicates that your sleep duration is much lower than the total amount of time you spend in bed. This could be due to sleep latency (the amount of time it takes to fall asleep, which ideally should not exceed 30 minutes) and sleep fragmentation (intermittent waking throughout the night). If you regularly take longer than 30 minutes to fall asleep and/or wake up multiple times most nights, your average sleep efficiency is likely to be low.
While sleep efficiency is a helpful metric to understand your sleep health, sleep debt is considered a better indicator. Sleep debt, or sleep deficit, is the difference between how much sleep you need and how much you actually get. It is the total number of hours of sleep you've missed relative to your individual sleep needs over the past 14 days. For example, if you get four hours of sleep when you need eight, you'll have a sleep debt of four hours. If this continues for a week, your sleep debt will be 28 hours. Sleep debt accumulates over time and can negatively impact your health.
Research shows that you can adapt to chronic sleep restriction, meaning that even if you don't feel sleepy, your body may already be experiencing significant declines in mental and physical performance. Sleep debt of over five hours will significantly interfere with your well-being, and you will be at a higher risk for various health conditions. To avoid sleep debt, it is crucial to learn how much sleep your body needs and improve your sleep hygiene. This includes keeping a sleep diary, developing a nighttime routine, adjusting your daytime schedule, and creating a sleep-friendly environment in your bedroom.
While napping can provide temporary relief from sleepiness, it is not a reliable solution for addressing sleep debt. Sleeping longer on weekends to compensate for sleep loss during the week has been associated with negative effects such as weight gain, increased calorie intake, and reduced energy expenditure. Therefore, prevention is the best strategy, and it is advisable to prioritize sleep and develop healthy sleep habits to ensure you get sufficient sleep each night.
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Sleep latency
The Multiple Sleep Latency Test (MSLT) is a professional test commonly used to diagnose sleep disorders. It involves measuring how fast a person falls asleep in a quiet environment during the day. Typically, the test requires the participant to take short naps at intervals of about two hours. If the individual does not fall asleep within 20 minutes, that nap is cancelled, and the sleep latency is recorded as 20 minutes. If the person does fall asleep, testers record brain activity for the subsequent 15 minutes, focusing on whether the participant reaches the REM stage.
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Sleep fragmentation
Sleep efficiency is the ratio between the time spent asleep and the total time dedicated to trying to sleep. A low sleep efficiency percentage could be the result of long sleep latency (the time it takes to fall asleep) and long sleep offset (the time it takes to wake up fully). Sleep fragmentation is one of the two main issues that can cause low sleep efficiency.
People with fragmented sleep tend to fall asleep quickly but wake up multiple times during the night for short periods of time. These are not the natural wakings that occur in humans but rather unnatural disturbances that lead to sleep interruptions that you remember during the daytime. Sleep fragmentation can contribute to insomnia, sleep deprivation, daytime sleepiness, and numerous other potential consequences of insufficient sleep. It can also lead to weight gain and certain mood disorders.
If you regularly take longer than 30 minutes to fall asleep and/or if you repeatedly wake up most nights, your average sleep efficiency is likely to be low. If you regularly experience issues with sleep latency and sleep fragmentation despite following best practices for good sleep hygiene, it could be a sign of a sleep disorder. Working with a health professional can help if your sleep is being interrupted by underlying sleep disorders or health problems.
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Sleep disorders
Sleep efficiency (SE) is the ratio of total sleep time (TST) to time in bed (TIB). It is calculated by dividing the amount of time spent asleep (in minutes) by the total amount of time spent in bed (in minutes). SE is given as a percentage, and a normal sleep efficiency score is considered to be 85% or higher, with most young, healthy adults displaying SE above 90%.
Low sleep efficiency could be the result of long sleep latency (the time it takes to fall asleep) and long sleep offset (the time it takes to wake up fully) with otherwise normal sleep in between. Sleep fragmentation, or intermittent waking throughout the night, can also contribute to low sleep efficiency. While waking up a couple of times is normal, especially at the end of a sleep cycle, high levels of sleep fragmentation can result in non-restorative sleep.
There are a variety of reasons why an individual may have low sleep efficiency. Poor sleep hygiene, or behaviours that negatively affect sleep, is a common cause. This includes daily behaviours, not just those performed before bed. Other factors that can impact sleep efficiency include diet, exercise, stress, anxiety, and lifestyle. Socio-economic differences and loneliness have also been shown to impact sleep efficiency, with people from lower socio-economic backgrounds and those who are lonely reporting lower sleep efficiency.
Low sleep efficiency can also be a sign of a sleep disorder. Sleep-disordered breathing, for example, is a common problem that can have life-threatening complications if left untreated. Obstructive sleep apnea is another sleep disorder associated with poor sleep efficiency. Sleep efficiency is an important parameter in clinical investigations and can be determined with a polysomnograph, or sleep study.
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Lifestyle factors
Sleep efficiency is the ratio between the time spent asleep and the total time spent trying to fall asleep. A sleep efficiency (SE) of 80% or more is considered normal, with most young, healthy adults displaying an SE above 90%. Poor sleep efficiency may be caused by sleep latency (the amount of time it takes to fall asleep) and sleep fragmentation (intermittent waking during the night).
Lighting
The body relies on environmental cues like light to regulate the sleep-wake cycle. Bright lights, especially in the evening, can suppress melatonin production, delaying the body's readiness for sleep by tricking the internal clock.
Sleep Environment
A comfortable and safe sleep environment is essential for quality sleep. Changes in surroundings, such as sleeping in a new place, can cause disturbances in falling asleep.
Jet Lag and Shift Work
Travelling across different time zones or working shift patterns that disrupt the body's natural circadian rhythm can result in jet lag, negatively impacting sleep efficiency.
Medication and Substances
Certain medications, substances, and prescription drugs can interfere with sleep. For example, caffeine, nicotine, and antidepressants can alter neurotransmitter activity or stimulate the nervous system, affecting sleep duration and quality.
Physical Discomfort
Body aches, muscle or joint pain, headaches, and other physical discomforts can hinder the ability to fall asleep or maintain restful sleep throughout the night.
Stress, Anxiety, and Depression
Psychological factors like stress, anxiety, or depression can trigger hyperarousal responses, making it difficult to fall asleep or causing frequent awakenings during the night. These conditions may lead to an imbalance in sleep stages, resulting in increased REM sleep and reduced deep sleep.
Dietary Habits
Dietary habits can influence sleep efficiency. Research has shown that disrupted sleep patterns are associated with a larger appetite and weight gain due to the increased secretion of the hunger hormone ghrelin and lowered secretion of the satiety hormone leptin.
Social Media Use
Excessive social media use has been linked to poor sleep health. Reducing screen time and engaging in relaxing activities before bed can improve sleep efficiency.
Physical Activity Levels
Incorporating moderate physical activity during the day can help improve sleep efficiency. However, it is important to avoid strenuous exercise close to bedtime, as it may have the opposite effect and disrupt sleep.
Sleep Hygiene
Sleep hygiene refers to daily behaviours that impact sleep quality. Maintaining a consistent sleep schedule, creating a relaxing sleep environment, managing stress, and adopting healthy lifestyle habits are all part of good sleep hygiene, which can improve sleep efficiency.
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Frequently asked questions
Sleep efficiency (SE) is the ratio between the time spent asleep and the total time spent in bed. It is given as a percentage, and a score of 80% or more is considered normal/healthy.
Low sleep efficiency means your sleep duration is much lower than the total amount of time you spend in bed. This could be due to long sleep latency (the time it takes to fall asleep) or sleep fragmentation (intermittent waking throughout the night).
There are various factors that can contribute to low sleep efficiency, including poor sleep hygiene, pain, illness, stress, anxiety, diet, exercise, and loneliness.
To improve sleep efficiency, focus on improving your sleep hygiene, which includes daily behaviours that impact your sleep. This may involve incorporating relaxation techniques before bed, such as meditation, reading, or taking a bath. Moving more during the day can also help improve sleep efficiency.
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