Take a walk if you can.:)
In general, drowsiness is feeling the need to sleep. Or many of these are known to cause fatigue and daytime drowsiness.
By and by a drowsiness overcame him, and Venters began to nod, half asleep, with his back against a spruce. OR Drowsiness seized me.
I walked dizzily with drowsiness all over me.
drowsiness
"She felt alot of drowsiness during the lecture and almost fell asleep."
Yes, just like any other opiate it can cause drowsiness in some people.
The abstract noun form for the adjective drowsy is drowsiness.
tse tse fly which is usually found in Africa in the Sharan region
Melatonin
sometimes
Yes.
It means the same as sleepiness; the state where you are falling asleep.