All humans dissociate.

You know, when you're driving and you succomb to highway hypnosis? You feel like you are in a trance and can forget miles you've driven.

Getting lost in a book or a movie and losing a sense of passing time and surroundings is another example, so is daydreaming.

See Dissociative Disorders or Dissociation for problematic dissociation caused by childhood abuse.     _{Thank you, drive thru}