Ok, thank you.
The nerve that supplies sensation to the face/scalp area is called the trigeminal nerve.
Here is a picture that shows the nerve and the areas it supplies:http://www.intelligentdental.com/wp-content/uploads/2011/10/trigeminal-nerve1.jpg
Typically, when there is a problem with this nerve, however, it is associated with sharp bursts of severe pain and not numbness/tingling....so it is a bit of a question as to what is going on.
I know that stroke has been mentioned...this is something that should be considered and ruled out; however it is an unusual presentation for stroke. More typically there will be facial weakness with drooping of one side of the face.
It is possible that you have simply compressed the nerves when you fell asleep on the keyboard. If this is the case, it may take a few days for you to return to normal.
Shingles, which is a reactivation of the chicken pox, can occasionally cause numbness/tingling along a nerve before the onset of the rash. Usually the rash will appear within 1-2 days.
But, I do feel that you should be evaluated by either your regular doctor or, if possible, a neurologist today....
If you develop any facial weakness, headache, slurred speech, difficulty swallowing or progression of the numbness (spreading of the numbness) you need to go to the emergency room.
Otherwise, I encourage you to make an appointment this morning with your doctor for an exam.
Please feel free to ask any follow up questions,