On my first weekend last fall, I eagerly shut it all down on Friday night, then went to bed to read. (I chose Saturday because my rules include no television, and I had to watch the Giants on Sunday). I woke up nervous, eager for my laptop. That forbidden, I reached for the phone. No, not that either. Send a text message? No. I quickly realized that I was feeling the same way I do when the electricity goes out and, finding one appliance nonfunctional, I go immediately to the next. I was jumpy, twitchy, uneven.