Boudoir is a slightly old fashioned word for a bedroom. You could invite a friend for a sleepover and say, "You can sleep on the spare bed in my boudoir."
Noun
a lady''s bedroom or private sitting room
n.
A small room, esp. if pleasant, or elegantly furnished, to
which a lady may retire to be alone, or to receive intimate friends; a
lady's (or sometimes a gentleman's) private room.
Usage Examples
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