Some restlessness during sleep is completely normal. Healthy adults change body position roughly 10 to 30 times per night, and brief awakenings between sleep cycles are a built-in part of how sleep works. The real question is whether your restlessness crosses the line from ordinary movement into something that fragments your sleep enough to affect how you feel during the day.
How Much Movement Is Normal
Your body doesn’t stay still all night, even during good sleep. Research tracking body movements during sleep found that younger and middle-aged adults average about 0.25 movements per minute of sleep, which works out to roughly 85 total body movements across a typical night. That’s more than one shift in position every five minutes during some stretches of the night, and it’s perfectly healthy. These movements tend to cluster around transitions between sleep cycles, which repeat every 90 minutes or so.
Movement frequency varies by sleep stage. During light sleep, your muscles still have tone and you can shift freely. During the deepest stage of non-REM sleep, sleepwalking and night terrors can occur in some people, though most sleepers are relatively still. During REM sleep, your brain actively paralyzes your skeletal muscles (a state called atonia), which is why you don’t physically act out your dreams. The only muscles that stay active during REM are your eyes and your diaphragm. So a large portion of your nightly restlessness happens during lighter sleep stages and during the brief transitions between cycles.
Brief Awakenings Are Built Into Sleep
Waking up during the night doesn’t automatically mean something is wrong. Most people experience micro-awakenings between sleep cycles and don’t remember them. The threshold that sleep specialists pay attention to is called “wake after sleep onset,” which is simply how many minutes you spend awake after first falling asleep. Up to about 20 minutes of total wakefulness scattered across the night is considered normal and unlikely to affect sleep quality. Once you’re regularly spending more than 20 minutes awake during the night, it’s worth looking at what might be disrupting your sleep.
Older adults naturally wake more often. People over 65 wake up an average of 3 to 4 times per night, largely because they spend less time in deep sleep. Sleep efficiency, the percentage of time in bed that you’re actually asleep, also declines with age, dropping by about 3% per decade starting around age 40. A sleep efficiency above 85% is generally considered healthy, so if you’re in bed for 8 hours and sleeping for about 6 hours and 50 minutes or more, you’re in a normal range.
What Your Sleep Tracker Is Actually Measuring
If you’re asking this question because your fitness tracker shows a “restless” score, it’s worth understanding what that number really reflects. Consumer wearables estimate restlessness primarily through motion sensors, and their accuracy has significant limitations. A validation study of 11 consumer sleep trackers found that most wearables overestimate total sleep time because they misclassify quiet wakefulness as sleep. If you’re lying still but awake, your tracker likely counts that as sleep. Conversely, normal repositioning during light sleep might get flagged as “restless” even though it’s entirely healthy.
Some devices are better than others at detecting wake periods in the middle of the night, but none match the precision of clinical sleep monitoring. Treat your tracker’s restlessness score as a rough trend indicator, not a diagnosis. A single night showing high restlessness means very little. A pattern of increasing restlessness over weeks, especially paired with daytime fatigue, is more informative.
Leg Movements: Normal Twitches vs. a Sleep Disorder
Periodic limb movements during sleep are brief, repetitive twitches or jerks, usually in the legs, that happen every 20 to 40 seconds. Most people have some of these without ever knowing it. The clinical threshold for periodic limb movement disorder in adults is more than 15 of these events per hour of sleep. That cutoff was raised from the older standard of 5 per hour after studies showed that many healthy people without sleep complaints exceed 10 movements per hour. So occasional leg twitches, even fairly frequent ones, don’t necessarily point to a problem unless they’re waking you up or leaving you unrested.
Why Babies Seem So Restless
If you’re watching an infant sleep and wondering whether all that twitching and squirming is normal, it almost certainly is. Newborns spend close to 50% of their total sleep time in active sleep, the early form of REM sleep. Unlike adults, who enter REM with their muscles paralyzed, babies in active sleep twitch, grimace, move their limbs, and make small sounds. This is a normal part of brain development, not a sign of poor sleep. By 6 months, active sleep drops to about 30% of total sleep time, and it continues to decrease throughout the first year as sleep patterns mature.
Common Triggers for Extra Restlessness
When restlessness goes beyond the normal baseline, environment and habits are usually the first place to look. Room temperature has a direct effect on sleep stability. Research on thermal environments and sleep found that the body maintains a “bed climate” of about 32°C to 34°C (90°F to 93°F) at the skin surface during normal sleep, regardless of room temperature. When room temperature strays too far from about 18°C to 21°C (65°F to 70°F) for a clothed sleeper with bedding, both deep sleep and REM sleep decrease while wakefulness increases.
Other common culprits include caffeine consumed within 6 to 8 hours of bedtime, alcohol (which fragments sleep in the second half of the night even if it helps you fall asleep initially), an inconsistent sleep schedule, and stress or anxiety. Screen use before bed can also delay the onset of deeper sleep stages, leaving you in lighter, more movement-prone sleep for longer stretches.
When Restlessness Points to Something Else
Normal restlessness doesn’t leave you feeling unrefreshed. If you’re getting 7 to 8 hours in bed but consistently waking up exhausted, or if a bed partner reports that you kick, thrash, or stop breathing during the night, that pattern suggests something beyond ordinary movement. Conditions worth investigating include obstructive sleep apnea (which causes repeated micro-awakenings as your airway closes), restless legs syndrome (an uncomfortable urge to move your legs that worsens at rest), and REM sleep behavior disorder (where the normal muscle paralysis of REM fails, causing you to physically act out dreams). Each of these has specific, effective treatments, but they require a proper sleep evaluation to identify.
The simplest self-check is this: if you fall asleep within about 15 to 20 minutes, spend fewer than 20 minutes awake across the night, and feel reasonably alert during the day without relying on caffeine, your sleep is likely fine, regardless of what your tracker says about restlessness.