drowsy [ˈdraʊzi]

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adj.昏昏欲睡的，令人发困的

being in a state between sleeping and being awake

Exhaust fumes made him drowsy and brought on a headache. 废气把他熏得昏昏沉沉，还引起了头疼。
I feel drowsy after lunch every day. 每天午饭后我就想睡觉。