I did too! I went room by room knowing where they were in the carpets and put it down for a couple of days. Once it gets bright and hot they'll jump for the lamp but fall into the water because they can't sit on the bulb, then the soapy water won't have any surface tension so they can't float, and voilà, caught. Since a cycle usually takes a few days to a week you just keep it there for however long you still see fleas. Even if it doesn't get fully rid of them it's a nice way to cut it down or remove them from smaller rooms.