Fitbit has shared the data collected from its users’ devices.

The average Fitbit user is in bed for 7 hours and 33 minutes but only gets 6 hours and 38 minutes of sleep. The remaining 55 minutes is spent restless or awake. That may seem like a lot, but it’s actually pretty common.

“Sleep is not completely still,” says Fitbit Advisory Panel sleep expert Michael Grandner, MD, director of the Sleep and Health Research Program at the University of Arizona in Tucson. “It’s perfectly normal to have periods of restlessness—10 or even up to 30 could be normal for you.” (Here’s when restlessness might be more concerning.)

That said, 6 hours and 38 minutes is still shy of the 7+ hours the the CDC recommends adults get. If you tend to fall short as well, try to bank those extra minutes: Fitbit data confirms that sleeping 7 to 8 hours gives you the highest combined percentage of deep and REM sleep. In fact, 7.5 hours of sleep is the point at which you typically start getting less percentage of REM and more light.