Counterproductive to sleep

The following things have been proven sleep enemies(some may appear obvious, but you likely don't plan to prevent them until you're sprinting to the door, chasing the dog or flailing to find that ringing noise:

-hunger
-barking dogs
-sirens
-smoke alarms
-mailmen
-FedEx and UPS
-Hispanic Jehovah's Witnesses (no offense to anyone)
-census workers
-cell phones
-toys that take on a mind of their own
-garbage trucks

I'm sure I'll add more. :)
Sent from my Verizon Wireless BlackBerry