Actually...
there were several larger impacts whcih occured in the last century, particularly at Curacao and Rupini -
http://abob.libs.uga.edu/bobk/ccc/ce091702.html
I ommited blast sizes from the short descriptions, so you will have to follow out the links to see if greenland or the south west pacific impact was larger than this one.
And no, you would not have slept through it if it had hit LA.
all teh best,
ep