From one moment to the next

Posted by Denis on September 01, 2001

Does anybody know the exact meaning of the phrase "from one moment (minute, day, etc.) to the next"?
I am Russian and I have seen it many times in English texts but can't find it in dictionaries.
Example about a person who often changes his behavior patterns: "You can't tell who he is from one minute to the next."

• Until the cows come home joe antosh 09/17/01
• Until the cows come home joe antosh 09/17/01
• From one moment to the next R. Berg 09/01/01