If you can't sleep, then get up and do something instead of lying there worrying. It's the worry that gets you, not the lack of sleep.
“True wisdom is less presuming than folly. The wise man doubteth often, and changeth his mind; the fool is obstinate, and doubteth not; he knoweth all things but his own ignorance.”
“Being slightly paranoid is like being slightly pregnant - it tends to get worse.”