So far what I have noticed in a few months with about 3” is that I sleep less, and feel ok, about half an hour less. I’m gonna start trying 6” and let’s see.
And, for whatever reason, I feel like if inclined bed is the way to sleep, when bed is inclined I feel more comfortable, if not, I tend to look for pillows and things to elevate my torso. There must be something instinctive about sleeping inclines, otherwise people wouldn’t look to use pillows and cushions.
I noticed right away that i felt less vulnerable sleeping on a incline, i have been pondering why that is, maybe my nervous system knows it can respond faster then when lying flat.
In Feng Shui they talk about for the bedroom its important to have your bed set up with you always facing the door, so you feel safe knowing you can see whoever comes through the door. Our senses are always scanning and aware of our environment, i find lying flat feels too submissive, even the 3” incline really changes perspective for me, i would think this must have a very beneficial effect to sleep all night with a more relaxed nervous system.