When people tell me their back hurts most when they first get up in the morning it tells me one of two things:
They’re sleeping in a worn-out bed.
Or - they’re sleeping in the wrong position.
I think it’s pretty much common sense that if you’ve been sleeping (resting) for 5- 7 hours - you ought to be feel pretty good and rested.
And if you’re in pain when you get up, then something is wrong.
A bed is supposed to support you. If it is old and broken down it can’t do that for you anymore.
A very good, expensive bed is good (and supporting), for about 8-9 years.
Then it’s time to replace it.
Now, if the bed is still in good shape and it still supports you and you’re in pain, it might be a good idea to look at the position you’re sleeping in.
Many people I see in practice sleep on their side in a fetal position or in what I call the semi-crawl position with one leg straight and the other one dragged up in a partial crawl position.
If you sleep in either of these positions you’re putting pressure on the sacro-iliac / pelvic joints in a manner they were never intended / designed to have pressure...
They are weight bearing when standing and sitting, not laying on them. What’s more - laying in that semi-crawl position is actually applying a twist to them.
Ask somebody to twist your hand at the wrist and hold it like that for half an hour and see how that works for you. I’ll bet your wrist bothers you until next Labor Day.
That’s exactly what you’re doing to your hip joints when you lay on them in the semi-crawl position.
If someone with no hip pain or low back pain were to sleep like that every night they would very likely develop hip and back pain in a short time.