retire vs go to sleep

retire and go to sleep both are verbs.

Word	Noun	Adjective	Verb	Adverb
retire	No	No	Yes	No
go to sleep	No	No	Yes	No

As verbs, retire and go to sleep are synonyms defined as:

Other synonyms of retire include bed, crawl in, go to bed, hit the hay, hit the sack, kip down, sack out, turn in.

retire (verb)	go to sleep (verb)
prepare for sleep	prepare for sleep
cause to get out
cause to be out on a fielding play
lose interest
pull back or move away or backward
dispose of (something no longer useful or needed)
break from a meeting or gathering
go into retirement; stop performing one's work or withdraw from one's position
withdraw from active participation
make (someone) retire
withdraw from circulation or from the market, as of bills, shares, and bonds