To kill a nightingale

Thoughts at 2.00 am:

When I awoke this morning
When all things bright are born
A bird sat on my window ledge
And sang hail to the morn

He was so young and pretty
And so sweetly did he sing
That thoughts of joy and happiness
Into my heart did spring

And as he sang so sweetly
And woke me from my bed
I quickly brought the window down
And smashed his little head.