Which of the following occurred before Raju went to sleep

A．He felt uncomfortable to lie on the mat prepared by his mother and complained that there was something itching.
B．After he lay down to sleep he wanted his mother to move as close to him as possible.
C．He learned a lot about the legendary hero Devaka from the story which his mother told him before he went to sleep.
D．His father returned soon after he and his mother fell asleep.