Night time troubles

For the past few days my little man SCREAMS none stop at night time. (He was born May 4th) he is completely fine during the day but as soon as night time comes around he is screaming no matter what we try and do to make him stop ! It was so bad last night I had to walk out of the room before I broke down and cried . And even this morning he is as calm as can be !!!! No clue what is going on!