The state of being sleepy or feeling like you're about to fall asleep.
From 'drowse' (to be half-asleep) plus the suffix '-ness' (a condition). 'Drowse' comes from Old English 'drusian,' meaning to sink into sleep. The suffix '-ness' creates abstract nouns describing states or qualities.
Drowsiness is actually your brain's way of telling you it needs rest—but it's a terrible time to drive! Interestingly, people often experience 'sleep inertia' when waking from drowsiness, meaning it takes your brain several minutes to fully engage.
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