That feeling

During my walk, I kept on yawning and kept walking on...

Each time I yawned, it felt as if I became a little bit more awake...

Yawning till I started tearing...

Almost towards the end of the walk when I was on my way back to class, I have this sensation that sometime came down through my body.... I felt pain... and.. my body started shaking like what happens always....

For instance, the hands were shaking so bad that I was having problems logging in to a computer to make some printout...

It continued to shake so bad that it continued to shake even after I arrived at the class.

Eventually, it stopped and I was able to take notes again.