Ok. Mr. Know-it-all to the rescue!
All kidding aside this works. My best friend rented a house after college and a fellow living there had dogs with fleas. It was so bad rooms looked "foggy" about a foot down.
Here's what she needs: 1) a shallow pan 2) dish detergent 3) a desk lamp. Best is those flexible ones you can adjust, usually halogen.
Pan you get at dollar stores...plastic, aluminum, doesn't matter you want large but shallow (18"+ across, about an inch or two deep).
Place pan in center of room (a pan in each room except bedroom even better). Fill a third full of water. Slowly pour in dish detergent...slowly, no bubbles. Just maybe an ounce or two. This covers water making a film. Desk light positioned over center of pan, about 6 inches light to liquid.
Of course exercise safety, light doesn't get too hot and/or can tip into water.
Now! Turn on light at night. As people go to bed. You want bedroom pitch dark.
Fleas are attracted to light and jump in...but they can't get out.
Report back how it works out!