how to have sex?

For moms with toddlers, how do you find time to have sex? When I have a positive OPK I want to find a time to BD but with a two year old, who doesn't nap, I can't seem to figure it out a time to! 
Is BD at 10pm too late? Would I miss the ovulation? I can't get a babysitter and I've tried to put the iPad on but she ends up following us upstairs once she realizes we are gone.