The feeling of sleepy needs to be countered by the feeling of..uhm…wakey?

“I was really thinking what’s the cause of it. And got several reasons as listed below:”

You forgot one reason for your ‘feeling of sleepy,” which is: you are sleepy and it’s not just a feeling.

“1. Maybe I am already tired.” –

Yeah, the feeling of tired gives you the feeling of sleepy.

“2. Maybe because of lack of Oxygen because I am always wearing a closed-type helmet.”

Uh…did you get your helmet from a NASA garage sale? Maybe you forgot to buy the oxygen tanks that go with it? Like the ones they used on Apollo 13?

“3. Maybe I need to take Iron.”

Sure, and don’t forget the ironing board.

“4. Maybe I need to take a nap first before driving.”

Save time. Take a nap while driving. The feeling of sleepy will go away.

“5. Maybe I really need to take energy drinks.”

Yes, you really need to. Energy = MC2.

“6. Maybe my blood pressure raises again.”

And again, if you take me seriously.