Sleep well

I have problems waking up before 9am without alarm. I have very irregular sleep, I often work late hours and never go to bed before midnight. It’s even worse in winter when days are short and mornings are dark. I could sleep 10 hours and still be tired. I don’t need long sleep, just quality sleep! I used to be happy waking up 6am, before the alarm went off – that was 4 years ago. Then depression fucked up my sleep completely and I still can’t get it in order – nor sleep nor tackle depression.