I had to sneak before too. I would just be up late, do it at work or whenever she wasn't there. To say, this didn't last very long as she got suspicious and eventually I came out that I didn't want to go out and she was forced by her JW family and elders to leave me.
Either way, I would suggest telling your hubby you don't want to go to the KH anymore. It may be hard and break up your relationship (if you're still interested in living with a person like that is another question) but it's absolutely necessary to keep your sanity.
You'll also be sleeping better as you'll be able to do the things you want (being on here) during the daytime.