It’s the lack of REM sleep that really fucks you up. Those first months and years are brutal. I suggest making a habit of something that pulls you out of auto pilot. It can be as simple as a phrase like ‘‘close the door, check the kid’’ or ‘‘turn off the engine check the back seat’’ if it’s a habit, it will reenforce what your doing even when you haven’t had a solid 8hrs in almost a year. Also, if you have a partner, it can be a good idea, when possible, to switch night duty on baby so you can recharge, but honestly, it’s impossible if you can ever hear the baby fuss your animal instincts shoot you right up.