Had I not been awake I would have missed it,
A wind that rose and whirled until the roof
Pattered with quick leaves off the sycamore
And got me up, the whole of me a-patter,
Alive and ticking like an electric fence:
Had I not been awake I would have missed it
It came and went too unexpectedly
This is a perfect  iambic  line, with an additional unstressed syllable at the end. There is a palpable sense of movement and progression as the speaker jumps up, brimming with motion. 
 There is no “I awoke” or “I got out of bed”– the speaker is forced up by the wind, in the simplest of terms: “And got me up”.
Had I not been awake I would have missed it