A glass of water will help from sleepiness.

Who among us did not have to stay well past midnight, finishing an urgent job or preparing for the exam! And relentlessly begins to fall asleep, a yawn attacks, eyes close themselves, closing ...
To the aid of the proven tools are called - strong coffee or tea, in a pinch, even tablets. But all this is far from harmless to the body and it is not recommended to abuse them.
But looking through the sites in search of another method of learning foreign languages ​​for his collection came across an unusual advice to combat drowsiness. I will quote verbatim:

Recall: even during very interesting, but unusual and intense activities, we unwittingly begin to yawn. To get rid of the so-called sleepiness is simple - just drink a glass of water. This, by the way, feeds brain cells with oxygen. After all, when a person thinks, he does work that is much more laborious than, say, digging up a vegetable garden. "Reactor", which in the body during such actions produces heat, needs to be cooled.

The board seemed relevant, especially given the current early heat. I tried it - it really helped! I work on and sleep like a hand off!
Try it and you can also help?
Waiting for the results of the experiment.