Complete utter silence and darkness ... complete darkness
I'm not saying it as a wish for death .. it was my favourite way of going to sleep when I was a kid, just complete silent darkness for a few hours to get a good night sleep.
I haven't had it in years ... wife sleeps with a nightlight and there is always a window to the street light, the hallway light or some light somewhere and its never quiet any more, some machine is running, highway noises or whatever.
As a teen, I used to just board up my room at night, even place black out curtains at night time and seal up my doorway to block out the light in the hallway. I used to find comfort in being able to 'see' in the dark on my own. Don't get me wrong, I'm afraid of the dark too and if I got caught in a strange new place in complete darkness, I'd probably freak out.