I woke up from a nap and my eyes were crossed for about 2 minutes.  they returned to normal, but it was very scary.  what is going on?

See PCP or neurology. Difficult to know answer without more information, like many of the questions posted on healthtap. Your doctor will want to know the answer to a number of questions: -has this happened before? -any other symptoms with the eye-crossing, especially neurological issues, such as gait difficulty, urinary problems, etc. -are you on medication? -female or male? Need answers to these before proceeding.
Diplopia. Dipolopia or double vision can manifest temporarily when you are tired. It should resolve quickly. If this becomes a common occurance or does not resolve quickly, i recommend seeing your eye doctor for an evaluation.