Tracking sleep

I've had a Fitbit for almost a week now, and the thing I'm noticing most is how erratic my sleep patterns are. Last night was the worst one. 

In all the reviews for the Fitbit, I read that it "helps" get you better sleep. I'm assuming this is from awareness. I've had bad nights like this before, but it's never been shown to me the next morning in such detailed measurement. But I'm wondering, what do I do with this? How do I fix it? I can go to bed earlier (I was actually in bed around 10:30, just couldn't fall asleep until after midnight), but how do I fix all the restlessness?