Meaning: It is essential for you to sleep immediately.
Choice of Words: The word "must" expresses a strong obligation or necessity. "Go to bed" is a common phrase that means to lie down and sleep. "Now" indicates the immediate present.
Alternative Expressions
It is time for bed.
Meaning: This means it is the right moment to go to sleep. It's like saying, The right time to go to sleep is now.
Choice of Words:Time refers to a period or duration. Bed is the place where you sleep. When you put them together, "It is time for bed" means that the appropriate moment for going to bed has arrived.
It is bedtime.
Meaning: This means that it is the right time to go to sleep. It's like saying, The time to go to sleep is now.
Choice of Words:Bedtime is a noun that refers to the time when it is appropriate to go to bed. When you say "It is bedtime," you are indicating that the time has come for someone to go to sleep.