8 to 3:30 is a full nights sleep for most people, when I first got sober I found that I had to follow a pretty strict routine of going to bed and waking up at the same times every day.
I also make sure that my bedroom is as relaxing as possible with no television. I also make sure that it looks as if I have a cleaning service. No matter what the rest of my place may look like, my bedroom is always meticulous. For me, it seems to take away the stress of the day when I'm trying to go to sleep.
When you feel like starting, think about why you quit!