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Hello and thank you for using JustAnswer. It would be impossible to tell you exactly why your husband likes to sleep on the couch every night without speaking to him. It could be something that he feels more secure and comfortable with the couch; or perhaps he started sleeping there for a few night and then just continued so now he is too used to the couch that it feels "right," to him. I would not worry too much though if he has done this in past relationships as well as it just appears most likely this is an unusual quirk by your husband.