Why do I go up and down 3-4 pounds in the same day?

Just curious.. I don't usually weigh more than once a week, but someone told me once that you should weigh every hour you are awake for a day. Then you will know when you are the lightest, so you can weigh yourself the same time every week. ANyhow, I was wondering why I go up and down 3 or 4 pounds, sometimes 5 in the course of hours.. up and down, up and down. Is this a normal phenomenon? Or does this signify my need to do something different, ie: More water, less water, less salt, more vits, etc.? Thank you.

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