Sleep Talk is a non-damaging Normal-type move. It is TM97.
Sleep Talk can only be used while the user is asleep, and will fail if the user is not. Sleep Talk randomly chooses one of the user's moves (other than Sleep Talk itself) and uses it. PP will be deducted from Sleep Talk only, which means that it can be used to execute moves that have no PP left.
While it is asleep, the user randomly uses one of the moves it knows.