It's 1.15am and I should be sleeping

In silence, thoughts have taken flight
Like constellations filling night.
Conceptions born in mind ignite
A sleepless plight, a sleepless plight.
Such restlessness abandons sleep
By deeming it a pleasure cheap
As, deep inside, ideas creep
Within mind’s keep, within mind’s keep.
Lo! Death has reared himself a throne
By making weary every bone
And leaving not, unturned, a stone
To sleep postpone, to sleep postpone.
What’s that I see upon the lawn
As hours slip past the telltale yawn?
First light appears and thoughts are gone
With break of dawn, with break of dawn.