1 AM is the 3rd hour in Emily Wants to Play.
This is the first hour in which Mr. Tatters becomes active. He and Kiki will both try to attack the player, and they can spawn at the same time.
Mr. Tatters will spawn within the vicinity of the player and kill if he/she moves until a sigh is heard.
Since Mr. Tatters loses patience quickly, he should always be handled first. Kiki will remain spawned for a longer time and does not kill automatically.