bedroom thief
Rare, literary term for a thief who steals from bedrooms, often while the occupant is asleep. Not used in modern everyday language.
Kantanshi is an old word for a thief who steals valuables from a sleeping person's bedroom.
The origin is uncertain; the kanji 邯鄲 may be ateji or a reference to an old Chinese story, but the exact derivation is unclear.