Room sharing?

My son is 6 months old and we live in a 1 bedroom apartment. His crib is in our room and When he was a newborn he slept fine in our room but when he hit the 4 month sleep regression me and my fiancé slept on the couch for a few nights that way when the baby woke up we could take turns putting him back down without waking the other up. Anyways not he’s 6 months and he WILL NOT sleep if were sleeping in the same room. We’ve been on the couch for almost 2 months and I’m so miserable. Neither of us snore or toss and turn very much so I’m not sure why he’s waking up so much when we sleep in there. How can we fix this?? I miss my bed 😭