idiom requests - Word for "blissfully oblivious"?

Is there an English word or idiom that describes a person who's blissfully unaware or oblivious to their surroundings? I always thought this word was "aloof," but "aloof" seems to hold a rather negative connotation, whereas the word I'm looking would almost connote a positive, like "living in a fairy tale" - or something along these lines. Is there a word for this, or is "oblivious" as close as we get?

Answer

A Lotus Eater .

1. Classical Mythology. a member of a people whom Odysseus found existing in a state of languorous forgetfulness induced by their eating of the fruit of the legendary lotus; one of the lotophagi.


2. a person who leads a life of dreamy, indolent ease, indifferent to the busy world; daydreamer.