/sci/ - Science & Math

For a long time I've been wondering if there is some proper psychological term for this feeling, but I wasn't able to find anything, probably because I don't know how to properly describe it.
Sometimes, when I'm not mentally preoccupied by other things, I suddenly get the feeling that I can only describe as becoming aware of my existence more intensively than usual, the feeling that my consciousness is binded to my body and that I exist in this world. (I hope the way I describe it doesn't sound like some esoteric bullshit)
Is there a name for this phenomenon?