One of my friends had the same issue. However, they only decide to sleep in separate rooms after trying to sleep in the same room for a couple of months.
My friend is the one attending to their baby when the baby fusses in the middle of the night. Her husband tried helping but was "rejected" by the baby. Hence, they decided to try sleeping in separate rooms so that at least one of them could get a good night's rest.
Right now, their daughter sleeps better through the night. Her husband has moved back into their room and will only sleep in the other room when the baby is particularly fussy.
I guess it really depends on the decision of the couple. There are pros and cons of sleeping in separate rooms. Her husband would likely get to benefit from a better night's rest if he sleeps in a separate room. However, if his wife needed some extra help from him, she should let him know about her concerns. They could experiment with different arrangements like what my friend did to find the best that suits them.
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