The best excuse so far

Over the years Simon has produced an endless list of excuses as to why he cannot get to sleep. Last week he came up with one of his best ever:
"I can't get to sleep because my pants are moving around."

I can just see what we are going to hear in the future:

• I can't get to sleep because my heart is beating
• I can't get to sleep because I am breathing
• I can't get to sleep because a butterfly in the Amazon fluttered its wings
• I can't get to sleep because of global warming