I think way more context is needed.

1. How many hours of continous uninterrupted sleep do you get per night?

2. How often do you find yourself waking up during the night for any reason, and if so, what reason(s)? Soreness and needing to shift? Bathroom trips? Unknown reason? Noise?

3. Does your jaw hurt after waking up? (Possibly grinding teeth or clenching jaw)

4. How dry do you feel? Do you consistently wake up feeling dehydrated?

5. How stressed are you, on a scale of 1 to 10, with 1 being zenlike calm and 10 throwing up panic attacks.

6. (Very common issue) Have you checked CO2 (carbon dioxide, not monoxide, just normal CO2 levels) in your room after sleeping in it? Rooms can be prone to bad airflow and CO2 slowly builds up overnight. Check for covered vents and ducts restricting airflow, try opening your window a bit. You can buy cheap air quality monitors online and test your rooms air quality in the morning after a sleep.

7. Are there any other places in your house you find sleeping or taking a nap doesnt cause this? Try paying for a 1 night hotel room, and see if sleeping in a different bed in a different building still has the same issues or not, to narrow it down to if its a you problem or an environment problem.

8. Record yourself sleeping, see how much you move around, snore, or see if you have sleep apnea.

9. Surprisingly your dentist is more likely to help test you for possible sleep apnea issues, as a huge amount of sleeping problems have to do with palette shape, overbite/underbite, etc. So talk to your dentist about this!