"drowsing" in the verb sense
1. snooze, drowse, doze
sleep lightly or for a short period of time
2. drowse
be on the verge of sleeping
"The students were drowsing in the 8 AM class"
"drowsing" in the adjective sense
1. drowsy, drowsing, dozy
half asleep
"made drowsy by the long ride"
"it seemed a pity to disturb the drowsing (or dozing) professor"
"a tired dozy child"
"the nodding (or napping) grandmother in her rocking chair"
Source: WordNet® (An amazing lexical database of English)
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