E.Q.
Hi T.,
My daughter did this when she was about 8 months old for a couple months when she would nap I couldnt figure out what was wrong with her til i asked my mother in law what could be the problem and she said that it could be that she is cutting teeth and it hurts her to the point where she is crying in her sleep! Then i started feeling in her mouth and sure enough she had like 3 teeth coming in at the same time! I started giving her a small dose of tylenol(wit hte docs ok) during the day so she wont be in so much pain from her teeth it stopped almost right away so that MIGHT be what it is! I hope i could help you out and if i didnt maybe someone else can! Good luck hun!