4 am is the 6th hour of Emily wants to play.
All of the dolls leave and you face 1 on 1 with Emily. She wants to play Hide & Seek. You have 75 seconds to find Emily.
At the start of the hour, Emily will turn off all the lights. Switching them back on before the game ends will cause Emily to kill you.
It is important to find the flashlight before this hour as it is especially useful now.