Answer:

dream

Answer	Crossword Clue
DREAM	Lofty ambition
DREAM	Lofty aspiration
DREAM	Martin Luther King Jr. had one

DREAM	An alarm may interrupt it
DREAM	Be unrealistic
DREAM	R.E.M. show?
DREAM	Night vision?
DREAM	It's all in the head
DREAM	Ideal
DREAM	Think optimistically
DREAM	What an alarm may interrupt

DREAM	Subject of a painting by Picasso or Rousseau
DREAM	Overnight sensation
DREAM	Vision that isn't real
DREAM	Bedtime story?
DREAM	It's unreal
DREAM	It's all in your mind
DREAM	Fantasize
DREAM	Fancy

DREAM	Late-night show?
DREAM	Enter the realm of Morpheus
DREAM	Subject of Freudian study