A state in which you are thinking about pleasant things: daydream.
1) I was in reverie and didn't even realize my flight was boarding till it was almost too late.
2) A knock on the door broke her reverie.
French réverie, from Middle French, delirium, from resver, rever which means 'to wonder', be 'delirious'.
daydream, study, trance, woolgathering
reality, nightmare, presence, life, truth.