I'm very sorry to hear that. If you don't mind me asking, how long did you consistently try it for? and did you see any improvement?
I tried about a month. Don't sleep between 6 am and 10 PM.
Very hard to do. And no results. Still keeping whole nights awake.
In that 8 hour window did you go to sleep only when you are sleepy?
That is the biggest guiding principle of sleep restriction. You want a fixed wake-up time but NOT a fixed sleep time.