bury your head in the sand

To bury your head in the sand is a figurative way to say you are refusing to confront or acknowledge a problem. Literally, when you bury your head in the sand you are blind and deaf to everything around you and have no recollection of what is going on. Therefore when used as an idiom, this phrase means basically the same thing, as you want to ignore the problems and negative atmosphere that surrounds you and remain oblivious to it.