Help! Newborn unable to fall asleep...

Hi mummies... any of you have experience of your newborn unable to fall asleep? My newborn is 1 month old now and seems like his sleeping pattern changed after the 3rd week. Now after getting up at around 5am, he is unable to fall asleep and keeps drinking and being very fussy and cranky all the way till 11am and sometimes even 3pm! 😑😢 He would drink milk and becomes sleepy but gets up after a few minutes. He can only go into deep sleep and sleep for an hour to three hours after 4 or 5pm... Please share your solutions if you have. Thank you!!!