Omniurnal

The rhythm of circadian states
That you sleep when it's dark,
And when it's bright, you waits.

And if your clock starts to get off course,
You must readjust nightly!
Counting sheep, cows, horse!

You fall forward. You delay;
Getting less and less sleep
Each and every day.

In the end, you're nocturnal
Or so it seems to be.
If you're still feeling tired, you're really mock-turnal.

But no matter what type of -urnal you are,
If you're not getting sleep,
You'll not be able to go as far.