> 2 million years of homo-noid evolution without pillows

What makes you think early humans slept on flat surfaces with no neck support? Is this something you've studied, or are you making things up?

Here's what gorilla nests look like:

https://www.berggorilla.org/en/gorillas/general/everyday-lif...

I'm sure early humans were at least as capable at making beds, and could make something that functioned as a pillow, or at least gave some neck support, if that was comfortable.

(To be clear, I know absolutely nothing about how early humans slept. I just suspect that you don't either.)

Not really, I use them mostly to support my head in side sleeping. Occasionally I'll use a folded arm instead, but that's uncommon.

Congrats on getting past the acclimation period, it seems obviously better for your back.

How has it affected your personal life? The last woman I dated was deeply offended by my disinterest in sharing her bed and insistence on sleeping on the floor after our first few overnights. This aspect of the practice seems the most problematic, it's had me consider moving to Japan.

I could never go back to sleeping on a thick mattress. I used to do 10" of foam, on a 10" box spring. Never again.

The mattress-pad I use is 4mm of sponge. I use it to help with air-flow under my body. I think I'm eventually going to wean myself off it and sleep on a sheet on a wooden floor (or perhaps a tatami mat type thing).

It helps a lot that I don't have a "steady" love-life. I keep a bed in a guest-bedroom for the dalliances though. Nobody else I've met in real life so far agrees with the concept of sleeping without a mattress. Pity (for them).

Look into orthopedic pillows: a good pillow is supposed to support your neck when you're on the back or your whole head when you're on a side when the shoulders are in the way. (Not sure about sleeping on the stomach, though.)

Evolution is a game of trade-offs and compromises, you know.