Do you have cellular phones that connect to your network? My iphone backs up everything to icloud every night at about 2 a.m. That can be substantial. There are apps that connect automatically and push notifications and the like. So, there are many reasons you might have data being used while you sleep. See if your wireless router can monitor and record your data traffic. That can tell you a lot.
All that said, I have written Comcast my last check as of yesterday. Next weekend I will have Fiber Optic 250 mbps, no data cap. Considering comcasts cap and the fact that my speeds have been only roughly 10 mbps (down from 25 a few months ago) I am looking forward to the switch.
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