i can totally relate! my little man is now 12 weeks and for the first 6 weeks would keep me up screaming all night and then have only cat-naps throught the day.. he is still waking every 2-3 hour at night and cries sometimes, but it is so much better now! yes i am still very tired but your body does udjust.. my bub has colic so i know the screaming and lack of sleep is from his tummy ache..if yours continues maybe have this checked out. dr's dont usually help.. best to go to homeopath or the likes. BIG TIP the only thing that settles him when he is over-tired/crying is bouncing on a fit ball with him. this usually puts him to sleep then i transfer him into his swing that swings when he is sleeping..or carrying in sling. hey if it works?? i know how u feel good luck!