This page contains information regarding Star Trek: Picard, and thus may contain spoilers.
Theela's species referred to bedrooms as "slumber chambers". In 2269, Theela ordered the other women to take the male landing party to the slumber chambers after they collapsed due to the effects of the Taurean headbands. The door was secured with a maglock which Spock managed to open with a medical scanner. (TAS: "The Lorelei Signal")
In 2370, Jadzia Dax told Pel that Quark once attempted but failed to recreate her childhood bedroom accurately in a holosuite after hearing her describe it to Kira Nerys. She appreciated his gesture until he tried to kiss her. (DS9: "Rules of Acquisition")
Tom Paris' most vivid childhood memories were the times that he spent in his room crying. He liked it because it was quiet and people would leave him alone when he locked the door. He recalled reading and playing games there. He also lost his virginity when he was seventeen and his parents were away for the weekend. (VOY: "Threshold")
The bedroom could also be a euphemism for sexual acts. In 2377, the Klingon T'Greth suggested B'Elanna Torres was on the submissive side of a sexual relationship with Kohlar, asking if she was his puppet in the bedchamber as well. (VOY: "Prophecy")
Guest room Edit
A guest room was a bedroom that was reserved for visiting guests. T'Pol's mother's home had a guest room on the south end of her house. The sub-commander mentioned it to Trip Tucker when he asked where he'd stay when they visited in 2154. (ENT: "Home")
In 2378, Irene Hansen recalled a six year old Annika once locking herself in the guest room and refusing to come out because she was upset about being left at her aunt’s farm for the weekend. (VOY: "Author, Author")