Sleep now.
Meaning: This means to enter a state of rest for the body and mind at the present time. It's like saying, Please enter a state of rest for the body and mind at the present time.
Choice of Words: Sleep is a state of rest for the body and mind. Now means at the present time. When you put them together, "Sleep now" is an instruction asking someone to enter a state of rest for the body and mind at the present time.
Alternative Expressions
Related Expressions