I don't have kids yet, but my wife wants them eventually. I see potential happiness in having them, but one thing that worries me is the sleep. I work out regularly (I compete in MMA), work full time, and I need 7-9 hours of sleep every night. I can always take an off season from fighting/working out, but just how long does it take a baby to sleep through the night? I get pretty crazy if I go too long without working out, and I can't workout without unbroken sleep. I also get pretty crazy with continued broken sleep.