Circadian upset

In the midnight blue
     Of autumn's night
I ponder my circadian plight.

Plying my craft from dawn
     To dusk
Back to my abode I trod,
     An empty husk.

The sofa beckons my weary bod.
     Eyelids flutter;
The new's "music" makes me nod.

Then at bedtime , do I awaken.
     Refreshed anew,
 Alert, my rhythm shaken.

But again when Moon is nigh,
     I'll briskly walk to work
And lend to you my watchful eye.