Remember that the fitbit considers rolling over 'waking up'. The point overall is to show you how you move through the stages of sleep. When you are in the lighter stages you will naturally move around in bed, shift arms, roll over, etc. While in the deeper stages of sleep you are more likely to remain still. Most people go through the stages over and over each night in about a 90 minute cycle. So if you see that you were 'awake' about every 90 minutes you were most likely moving through the stages properly and rolled over. Also, if you sleep with someone the fitbit often registers _their_ movement on your graph.
