> 11:00 PM sleep until 6:30 the next day

Dude, if your wife is getting up multiple times a night, you really ought to consider stepping in and helping out. True males can't do the feeding, but if there is anyway you can help out with this, I guarantee your wife will be grateful. If your kids sleep then ignore this, but sleep deprivation is hell (to most people). My wife and I both worked and we slept in 4 hour shifts, then when they slept more, we went to night on then night off. Saved our marriage.