I live in the city during the week for work (the commute would drive me insane) and then go home to the guys on the weekends. I've never been a big one for bars or staying out ridiculously late, so I take the time alone during the week to do the things I know the guys aren't huge fans of.
Emotionally, though, it can really suck. We're a MMF triad where there is some level of physical contact between each of us. Do I like sleeping alone most every night? No. But, the nights I can't be with T or E, I know they're at home probably talking in bed until they fall asleep at home. Focus on the good your being selfless for your wife is doing for her if you can.