Andrew Huberman· PhD
One of the things I say right off the bat is, sleeping on your stomach just doesn't really have many benefits. You're putting yourself into a position that is, depending upon the orientation of your mattress or how many pillows you're using, but you're basically putting yourselves into excessive extension of the lumbar spine, which for most people, isn't very good, if you're a disc patient, I guess that might be helpful, for relocating the disc. But I mean, for the most part, your hands are then usually not at your sides, but they're up under your arms, so you've got them into sort of internal rotation up over elevation in your head. It's just not a great position.