"drowse" in the noun sense
1. doze, drowse
a light fitful sleep
"drowse" 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"
Source: WordNet® (An amazing lexical database of English)
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