Sleep.
Easy to spell.
Easy to write.
Easy to say.
But hard for the insomniac.

Sleep deprivation.
Hard to spell when hallucinating.
Hard to write with eyes closing.  
Hard to say while decomposing—a rare case, it’s true.
But easy for the insomniac.

Why is it so difficult to:

    Stop for the night,
    Leave entertainment behind,
    Ease body in bed,
    Elude conscious thought, and
    Peacefully rest
    ?