Night Vacuuming

You know what I've always wondered about?  Why are there lights on some vacuums?  Is this for when you're vacuuming at night and don't want to wake anyone up? "Oh no I can't possibly vacuum right now because I'll wake everybody up by turning on the lights!"  Guess again dear friend; there is a light put so conveniently on the vacuum for that! For we all know that it will be turning lights on that wakes everyone up in the house when you're trying to night vacuum.  Not the vacuum roaring itself.  That is all. Clean on you night vacuumers!