What does the idiom 'hit the hay' mean?

[blindeye]

English Language Tests, Intermediate level

ESL/EFL Test #288 "English Slang Idioms (10)", question 1

He was very tired after a long day's work and decided to ......... the hay as soon as he got home.

(a) planted
(b) bailed
(c) hit
(d) swept

English Language Tests, Intermediate level

ESL/EFL Test #288 "English Slang Idioms (10)", answer 1

He was very tired after a long day's work and decided to hit the hay as soon as he got home.

Correct answer: (c) hit
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what is the correcat answer and why?

blindeye

[Mister Micawber]

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The correct answer is immediately above your question. 'Hit the hay' is an idiom meaning 'go to bed'.
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Native English teacher at Mister Micawber's