I feel rather grubby in saying this but we have fleas thanks to the combination of a household that has zero inertia to hoover and a cat.
I've just ordered a rather questionable device off ebay, essentially a lightbulb suspended over a stickypad. Will it work? I doubt it however for non-chemical control this is the only product on the market. I'll see how it works out. It may be that I have to go down the road of heavy chemical use... That or having the balls to say "let's have a cleaning rota" but I'm always "that" guy... I don't wanna be "that" guy. O well, watch this space