This will sound so strange, but my friends SWEAR by it, and it is free so give it a try. IF you know where the fleas are, take a bowl of warm very soapy water and put it on the floor, and when you go to bed and it is dark in the house, set one bright light directly shining on the water. (The light needs to be like a small table light- book light- or something. It needs to not be a lamp. Does that make sense? It has something to do with the heat of light right on the water and then they jump in the bowl and get sucked up by the bubbles- and die in the water. Again, it is worth a try, my two friends say that it worked wonders. Every morning- for about three mornings- they would have flees- and with regular vac. and cleaning, they were gone. Good luck.