Drooling is a slight hazard when sleeping on my front, even though my head is to the side. (What can I say? I'm in fairly good shape and don't have any neck or back problems. I find being on my front(ish) comfortable and relaxing without putting pressure on anything. Usually my forearms are under the pillow, often under my head.)

Mostly I don't drool. The odd time I do, I usually subconsciously feel it starting and wake up with a loud in-drawn slurp to reflexively keep from getting goober on the pillow. (Eew!) I thought that might be a little more than most people would want to know.

"Nest" is good. I should have used that phrase instead of "Snugly tucked in".

I put the chair option in because some people have physical issues and need a recliner or some such at times. Myself, I learned to sleep sitting upright in my 30s while traveling, but tend not to do it otherwise. I don't want to mess up my neck by not supporting it properly on a routine basis.

I kind of suck at this life thing -- but *sleeping* I can do. I can sleep in cars, trains, planes and boats. Haven't tried rockets yet, but I rather doubt it.