How to make my 4 month fall asleep earlier?

my four month old son has been staying up untill 3 in the morning!! he had his day in night confused untill 3 months! then he did ok i have a schedule bath 730 read a book turn lights down play softly nothing to rowdy and eat and he passed out. then all a sudden he stoped falling asleep after that last feeding and started staying up till midnight. and now he is staying up toill 3! he just finishes eating and looks at me and smiles! im going crazy! i wake him up at 8 and feed him and play and by 9 he is so grumpy and screaming. i put him back to sleep and he sleeps till noon. then wakes up eats and plays untill 2 takes a small 30 min nap wakes up eats and plays naps at 330 untill 430 wakes up plays till about 7. he is exclusivle breast feed and at night he sleeps 6hrs without waking. he refuses to eat if hes not hungry and he refuses to sleep if hes not tired. i have tried everything i can think of. any advise because i am really going crazy!