dream, vision, illusion
夢 centers on the mental experience of a dream: a vision or illusion that feels real while asleep or in a trance-like state.
夢 originally depicted a person in bed with an eye emphasized, suggesting a dream state. The modern form has been stylized, but the bottom 夕 (evening) and the overall structure still hint at nighttime visions.
The top 艹 looks like a canopy over a bed, the middle ⺫ resembles a closed eye, and the bottom 冖 and 夕 suggest evening. Picture yourself under the covers at night, eyes closed, drifting into a dream.
For ム, imagine a dream where a cow says 'moo' (ム) instead of mooing. The silly 'moo' sound cues ム while you dream.
dream
absorbed in; immersed in; crazy about; obsessed with; devoted to
nightmare; bad dream
having a dream
to dream (of)
lewd dream; salacious fantasy
dream; vision; reverie
dreams; fantasy; visions
(not) in the slightest; (not) at all
account of a dream
wet dream; nocturnal emission
revelatory dream; revelation; a vision
losing oneself (in); being absorbed (in); forgetting oneself
daydream; waking dream
first dream of the New year (believed to foretell one's luck)
sleepwalking; somnambulism; noctambulism
dream that comes true
nightmare
at the bedside where one dreams
long-cherished dream