@Arend-Jan Pothoven when I was first trying to regulate my sleep after a fairly extended period of waking up at 3:30 or 4:00 in the morning and not going back to sleep, I also discovered Yoga Nidra. My protocol is a little OCD. If I wake up and think "maybe I can't get back to sleep," I start counting back from 100. If I make it all the way to zero, then I know it's time to get up. Otherwise, if I drift off somewhere along the way, then I'll start again, and I just keep drifting off until I wake up and two hours have passed. But if I do get up, then I leave the bed (which I have a cardinal rule: "beds are for sleeping in"). And maybe one other thing, but not at least for me, Yoga Meditation. So I get up to my living room reclining chair, do a Yoga Nidra that goes from between 45 minutes to an hour, then get up and go straight back to bed. This puts me back in bed by 5 o'clock and gives me a couple of more hours of sleep until I wake up at 7. So I get the added benefit of 2 hours more sleep, plus the sleep credit I get for the hour of yoga nidra.