turn in vs go to sleep

turn in and go to sleep both are verbs.

Word	Noun	Adjective	Verb	Adverb
turn in	No	No	Yes	No
go to sleep	No	No	Yes	No

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

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

turn in (verb)	go to sleep (verb)
prepare for sleep	prepare for sleep
carry out (performances)
make an entrance by turning from a road
to surrender someone or something to another