Yes, it is an older idiom meaning go to bed. Hit the sack is more commonly used (US)
15 november 2019
2
0
0
Neither is super common, but they're both used. I wouldn't think anything odd of it if you said that you were going to hit the hay or hit the sack, as the other commenter mentioned. It's definitely very informal though.
15 november 2019
1
0
Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!