Learn English – What’s it called when you lose contact with reality when watching a movie

Sometimes, when I watch a (real good) movie, I feel like the movie "sucks me into the screen". I feel that I am really inside the movie, really watching real persons acting in real situations. I do not really see what happens around me anymore, I get some kind of tunnel view and see only the screen. It's like being in John Malkovich's Head, just not seing the borders that are around me from that weird cave.

I wanted to know if there is a word for this kind of experience.
Also, I'd like to know if there is a word for "re-gaining" reality. After a few seconds or minutes in this weird state, I feel like my field of vision is growing larger and larger (just as if I was about to leave Malkovich) and then I'm "back in reality".

It's a hard to describe experience for me, not only because my mothertongue is not english but german, but also because, afaik, german lacks words for this, too. But when I have the english words, I believe, I may find the german ones as well.