Tell me about fitbit, how does it determine the quality of the sleep you are getting? Also, you mention to "not drink alcohol" prior to sleep. Why not? I have a few glasses of wine or a couple of beers often prior to going to sleep and I always feel well rested the next day. Would I be even more well rested if I got rid of the alcohol?
The Fitbit uses the accelerometer in it to measure how much you move at night and then can tell how restless you are. Giving you a pretty good picture of total time asleep be subtracting the time you were restless. Yes, alcohol inhibits your ability to get into REM sleep, which is the most important part of sleep. Also, it has a quality that actually promotes wakefulness at first.
It increases deep sleep but reduces REM sleep. I've also heard, but I'm not sure if it's true, that the second sleep after drinking is much worse quality than normal sleep. So if you drink one day and sleep deeply that night, the following night will bring restlessness. http://www.webmd.com/sleep-disorders/news/20130118/alcohol-sleep