Well I don't know about your case, but I can tell you about mine. When my son was born he ate every 3 hours around the clock. By about 4 months he could sleep 5-6 hours at night, and gradually longer, up to 7 hrs. But then he started waking more often--aaaaugh! By 8 months I was feeling, as you say, like a zombie. I started to track how many times I got up to feed him in a night and found out it was often 6-8 times per night! My pediatrician assured me that after 4 months of age he did *not* need to eat that often. I did a lot of reading and realized that I was so super-alert to hearing him at night that I would often run in when he was just making noises in his sleep. (He would burp, sigh, squeal, and make as if the start of a cry, all fully asleep!) But my jumping up would fully wake him. And the more his sleep was interrupted, the more irritable and easily woken he became. I have not ever been a proponent of the 'cry it out' method, but we were having not only terrible nights but irritable days (both of us!). I finally tried a method to break the cycle. When I would hear him at night I would look at the clock and wait 5 minutes. It can seem like forever when your baby sounds upset, but its really not long and won't hurt. I found that probably 80% of the time he went back to sleep and seemed better the next day (interrupted sleep bugs them, too!). It helps a lot to have a baby monitor so you can assure yourself he is not caught somehow or in any danger. If he cried longer than 5-10 min I would go pick him up, make sure not wet, hungry, cold, etc. It was one of the best pieces of advice I have received! We both started sleeping a full 8 hours every night, with one occasional wake up per night to none. I was able to be more positive with him during the day and he seemed more happy also. :) On the flip side, my sister-in-law diligently got up every time her son woke her and says that he literally woke and ate every 2 hours for 3 years. OMG!