Why do your arms go to sleep at night?
What part of speech is sleep in the expression to go to sleep a verb or a noun?
The expression "Go to sleep." is a verb + a prepositional phrase (the subject of this sentence is implied, "you"). The verb is "go", the word "sleep" is a noun, the object of the preposition "to". Sleep is a noun and a verb. I usually sleep all night. - verb Last night I had a terrible sleep. - noun