nemuke ga tsuyoi toki wa, tsumetai mizu o nomu to sukoshi me ga samemasu.

When I’m very sleepy, drinking cold water wakes me up a little.

Breakdown of nemuke ga tsuyoi toki wa, tsumetai mizu o nomu to sukoshi me ga samemasu.

• は: topic particle
• を: direct object particle
• 水みず: water
• 飲のむ: to drink

Questions & Answers about nemuke ga tsuyoi toki wa, tsumetai mizu o nomu to sukoshi me ga samemasu.

Why is it 眠気 and not 眠い here?

眠気 is a noun meaning sleepiness or drowsiness.

• 眠い = sleepy (an i-adjective)
• 眠気 = sleepiness / drowsiness (a noun)

So:

• 眠いとき = when you are sleepy
• 眠気が強いとき = when the feeling of sleepiness is strong

The sentence uses 眠気が強い because it is describing the degree of drowsiness in a slightly more objective way.

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Why does 眠気 take が in 眠気が強い?

Because 強い describes 眠気 as the thing that is strong.

In Japanese, with many adjectives, the thing being described often takes が.

So:

• 眠気が強い = sleepiness is strong

This is very natural Japanese. Similar patterns are:

• 雨が強い = the rain is heavy
• 風が強い = the wind is strong
• 興味が強い = interest is strong

Here, が marks what has the quality of being strong.

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What does 強い mean here? Is it literally strong?