Is it normal to bite while you're asleep

(pardon my english, i'll try to be as accurate as possible)
Last night my boyfriend and i were sleeping, i was having a nightmare in wich i had to defend myself from a man who was attacking me, so i bit him, suddenly, i woke up with my boyfriend sceaming i was biting him!!! what i want to ask is if that means i have a sort of repressed anger or ill-feeling towards him, or if could be just the coincidence that he was near me at that moment? this is the first time that happens, and i love him very much... i feel terrible!!!