I usually sleep on my side. I have an awesome new mattress and use on of those tempurpedic type S-shaped pillows (the thicker more expensive kind, not the thinner cheap one. I do okay if I stay in position. If I roll back or forward, my neck is really stiff and painful the next day and it wakes me during the night.

Do you think you are sleeping in a weird position or might it be related to doing more because of the holidays ?

I hope it improves for you.