reverie (n.)

• absentmindedness
• absorption
• abstractedness
• abstraction
• amnesia
• bemusement
• catalepsy
• concentration
• contemplation
• contemplativeness
• daydream
• daydreamer
• daydreaming
• daze
• dream
• dreaming
• engrossment
• fantasy
• fugue
• incubus
• meditation
• melancholy
• muse
• musing
• nightmare
• pensiveness
• preoccupation
• reflectiveness
• sleepwalking
• somnambulism
• speculativeness
• stargazing
• study
• stupor
• thought
• thoughtfulness
• trance
• vision
• wistfulness
• woolgathering