I live on my own too. I find that it's best to keep things as simple as possible.

I know what time I naturally wake up at and what time I need to leave for work at. So my alarm is set for around the time I wake up naturally - as it gives me 2 hours to get ready and relax in the morning. Of course, I rarely wake up to the alarm because I'm already awake!

Knowing that time, I worked back roughly what time I would need to go to sleep at to get my 8 hours - so I go to bed before then and read to relax so that I'm ready to sleep.

I typically have a 5-6pm supper time because that's what I was raised with - figured I may as well stick to what I am used to.

Just see what's pretty much a habit already, and then try to keep to it even on days when you might not feel like it!

(You could also put up a to-do list somewhere)