Going to bed on time does not always mean getting a restful night. Sleep efficiency measures how much of your time in bed is actually spent asleep, offering one way to understand how easily you fall asleep and stay asleep.
How sleep changes with age
Sleep efficiency is generally fairly steady through childhood and adolescence, then tends to decrease in adulthood. Research suggests the shift can be noticeable in midlife, roughly between ages 40 and 64. Some estimates show average scores moving from around 89% to 79%, though patterns vary between studies and individuals.
Zachary Strumpf, a sleep medicine physician at University Hospitals, notes that age is one factor among several. Pain, certain medications, stress and other health issues may also affect sleep. Nishay Chitkara, director of sleep medicine at NYC Health + Hospitals/Bellevue, describes the measure as the share of time asleep compared with the time spent in bed trying to sleep.
Understanding your sleep efficiency
To calculate it, divide the minutes you slept by the total minutes you spent in bed, then multiply by 100. Scores around 85-90% or higher generally suggest that falling and staying asleep is not a major challenge; a score below 80% may point to disrupted sleep. The metric is only one part of the picture: total sleep time matters too, and adults generally need at least seven hours.
Building steadier sleep habits
A regular bedtime and wake-up time, limiting late-day caffeine, avoiding alcohol close to bedtime and reducing screen use before sleep can support healthier routines. Spending less time in bed before you feel ready to sleep may also help. Sleep trackers can reveal patterns in habits and surroundings, but they do not replace medical advice.
Persistent trouble falling or staying asleep, or significant daytime sleepiness, is worth discussing with a healthcare professional. Better understanding of sleep patterns may help people make informed choices and support healthier rest as they age.
