Thank you for that additional information.
The most likely cause of this numbness is pressure on your head while you are sleeping.
It is very unlikely to be due to any sort of vascular issue, nerve problem, etc.
It you were really concerned then you could have your doctor take a look at you during an episode of numbness so she could map out the extent of the affected area. In the end, however, I am afraid that even the most extensive medical workup will be unable to find any underlying cause that can be treated.
The good news?
There is very little chance that this is a sign of anything serious.
Does this make sense to you?
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Dr. Rick MD FACS