I'm trying to find some advice-guidance on this weird problem. It used to be laying down was about the most comfortable position for me; I'd spent entire weekends watching TV in bed, I even built an elaborate "bed desk" because laying was far more comfortable than sitting. About once or twice a year I might sleep "funny" and wake up with sore neck for a couple of days, then it was back to normal.
About 8 months ago, this happened to me... and ever since I've been dealing with neck and shoulder aches every time I lay down. I've replaced the mattress(needed a new one anyway) and tried 4 different pillows, little to no improvement. I've started doing nightly stretches and that has helped, but it really only went from "can sleep for 4 hours" to "can sleep for 8 with interuptions and wake up very sore".
On the one hand, its nice because I'm suddenly way more productive in my free time, but the downside is I'm in almost constant mild pain either from the discomfort of sitting or lingering pain from sleeping.
I kept hoping it would improve, but its not; and I can't easily go see my chiropractor due to the pandemic.