in hamlet, when does hamlet preserve his sanity?

Question

I am so lost please help me

Answer 1

This may help:

http://www.sparknotes.com/shakespeare/hamlet/

Answer 2

This might help, too:

http://www.enotes.com/topics/hamlet

I'm a bit confused by the question. Hamlet is never "insane," but only acts crazy, until after the play. Maybe that's what the question asks you to identify. After he is exiled to England, he acts quite sanely.