is saying "mad about it" an idiomatic saying?

[GCSE]

English Language Tests, Intermediate level

ESL/EFL Test #326 "English Slang Idioms (47)", question 6

"Did you do anything in the warehouse, Ned? Or were you just back there counting ......... until shift was over?" His boss asked. He caught him sleeping last week and was still mad about it.

(a) goats
(b) tiles
(c) sheep
(d) peanuts

English Language Tests, Intermediate level

ESL/EFL Test #326 "English Slang Idioms (47)", answer 6

"Did you do anything in the warehouse, Ned? Or were you just back there counting sheep until shift was over?" His boss asked. He caught him sleeping last week and was still mad about it.

Correct answer: (c) sheep
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is saying "mad about it" an idiomatic saying?

GCSE

[Linda]

Hello,
Not in this case. In this case, it simply means "being angry" about something. However, "mad about something" is an idiom at times and it refers to liking something very much. For example, "I'm mad about poetry." This means "I really like poetry."
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[Nenad11]

Does to count sheep mean to fall asleep? many thanks for all you dear knowledge sharers there?