Sometimes I wake up shaking uncontrollably, any thoughts?

Sometimes I wake up shaking uncontrollably like I'm cold. I thought it might have been because I'm a little bit underweight. To be safe I went to the doctor but everything is normal. I tried sitting in the shower to help and it did, makes it go away quicker. Yes I've been cold before but not to point where I'm shaking uncontrollably.

Anybody else have this issue or am I just weird?

🥶

Sometimes I wake up shaking uncontrollably, any thoughts?
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