Are you on meds? I agree that a good sleep routine is important, but depression can really mess up our sleep.

I have fibromyalgia in addition to depression, and it really messes up my sleep unless I have the right med to combat the sleep disruption. I used to take Ambien but now am using 7.5-15 mg Remeron/mirtazapine at bedtime.

If I don't take a med for sleep, my sleep "clock" will move to my wanting to sleep from around 4 am - 11 am.

I've been in that spot where I couldn't wake up with an alarm clock. If you live alone, it's especially problematic, because even if you do wake up with the alarm, you may not be fully awake and the part of you that needs more sleep will win out.