Do you wake up with a stiff neck or a slight ache in your back? Or perhaps you feel a tightness in your hip?
It could be related to how you sleep.
I used to wake up with a stiff neck quite often. The solution to that issue was rather counter-intuitive. I stopped using a pillow. This is because my neck and the rest of my body was in a better posture without the pillow than with the pillow. If you are someone who's at 4 pillows, going to zero will only make your issue worse. So, don't take "remove pillows" as the takeaway here.
I also used to wake up with a weird niggle in my back. How stupid and awful is that? At least, the neck I can understand. Until I realised that I was sleeping on my belly with one leg semi-straight and the other leg bent quite a bit. This made my hips rather tight on one side and caused an issue for me.
I decided to fix it and learn to sleep in savasana. Once again, this might not work for you and I recommend you check out this article for how to modify savasana to suit you better.
The idea sounds simple. But the execution was not so simple.
I'd go to bed looking like this guy in the photo. I'd wake up looking like this.
So, I put obstructions around myself to make it uncomfortable if I shifted postures or positions while asleep. If I tried to turn to my side, I'd have an uncomfortably large pillow blocking me. If I tried to put my leg over it, it was distinctly uncomfortable. After a few shuffles, I'd go back to savasana. As stupid as the idea was, it worked!
The point is not to sleep in savasana but to determine if you are spending a third of your day worsening your posture, rather than recovering. Identifying the correct prop could make a huge change. For example, putting a pillow under my knee helped tremendously to settle my lower back down better. For you, it might be to elevate your upper back as well as the neck.
Take your time to do this and play around with what feels good.
And then slowly increase the amount of time you spend every night over there. Or you can be an impatient person like me and jump to the end. I got lucky, to be quite honest.
Improve the quality of your sleep and your posture. Find the best posture for you. And see what you are missing out on!
Note: The savasana modification images are from the article I mentioned earlier - accessibleyoga.blogspot.com