noun
Rare medical term; in everyday language, 夢遊病 (むゆうびょう) is used instead.
See also: 夢遊病
夢中遊行症は睡眠障害の一種で、睡眠中に歩き回る症状を指す。
Sleepwalking is a type of sleep disorder characterized by walking around during sleep.
Common term for sleepwalking; 夢中遊行症 is a rarer, more formal medical synonym.
Compound of 夢中 (むちゅう, 'in a dream') + 遊行 (ゆうこう, 'wandering') + 症 (しょう, 'condition'). The exact historical derivation is uncertain, but the term is a modern medical coinage.