Why is it that I can only write lyrics when I'm really tired and want to go to bed?

It's almost 4am and I can't stop for fear of not being able to write anything in the morning! That has actually happened before...

Gibber!

A desolate mind sits blankly supping
On a cold cup of coffee.
Nerve endings functioning – they’re
Conscious but unaware.

The Steady flow of caffeine keeps
Eyelids ajar, pupils vacant on
The screen. Tiring.

Growing bored, tired of the
Meandering nonsense of
Night. Coffee!

Every sound becomes amplified:
Every knock, every scratch somehow
Personified. Sleepy Paranoia, great
Fun when you’re in control!