Why can you discover a staggering difference in your ability to remember after a nights sl

Why can you discover a staggering difference in your ability to remember after a nights sleep？

A．Your memory is strengthened during the sleep.

B．Your brain has had a very good rest.

C．Your brain works better during sleep than you"re awake.

D．Your memory ability is better in the morning.

请帮忙给出正确答案和分析，谢谢！