At that age, my daughter slept in the wrap in the evenings from about 7/8pm until we went to bed at 10/11pm, then we brought her to bed with us. She wouldn't have slept without us at that age, so the wrap worked great and also I think helped to acclimate her to an earlier bedtime. When she was 4 months old, we started to put her to bed upstairs without us around 6/7pm and it was an easy transition. I think if doing a 'bedtime' isn't working yet, there's no reason to force it or stress about it. If one of you can hold your LO or use a wrap until that later 10/11pm time then all go to bed at the same time, then great. Do it until an earlier bedtime gets easier, which it will in time.