In the1970s I was depressed. I had previously slept equally on all 4 sides, left, right, stomach and back. I discovered that sleeping on my stomach increased my depression. Since then I have never slept on my stomach.
It didn’t cure me. I’ve learned to function with my depression. Sleep position helps. Mtn Dew helps. No other medicine I’ve found helps.
Twenty years ago I developed severe insomnia, almost overnight. The doctor diagnosed it as a symptom of depression and sent me to a shrink.
The shrink told me I couldn’t sleep because I was depressed. I told him I wasn’t depressed, and if I was it was because I couldn’t sleep.
I went and had a sleep study done. It showed I was stopping breathing some incredible amount of times per hour.