Battle With Sleep

My eyes are heavy, but I won't give in
I spend all of my energy on only one thing
It's only been a minute, but it feels like an hour
My own personal battle that I can't seem to beat
While in the face of sleepiness, I cower
But still I try to fight on
Trying to not let the up and the bottom meet
Forcing those eyelids to open, it's a hard task
They close down again
This time I don't have the power to keep them apart
And so, sleepiness won, but I'll make sure I win the next