140?

Counting syllables like sheep
Is a fairly solid way
I can get myself to sleep
At the end of every day
But sometimes my mind in counting
Grows too interested in how
Rhymes and meaning keep amounting
To much more than I allow.
So sometimes poems do not make
My nighttime easier, but flip
My mindswitch on, and therefore take
Away the time when I should slip
To sleep. That risk is always there
But still I count, because I dare.