So last night, I put the mad man in his bassinet in our room at 8:30, waited until he fell asleep, then went downstairs to watch the Office with the BHE and drink wine. This was the first time he was asleep away from me for any significant amount of time (and it was only 45 minutes before he woke up, realized I wasn't there and screamed his head off until I went in there and picked him up.)
Anyway, as the BHE pointed out, I was supposed to relax and enjoy this time. I did not. My whole body was tensed up, anticipating his crying and, upon not hearing any, convinced that he had stopped breathing while I was downstairs neglecting him and living it up with a glass of wine. So of course I had to go up there and tiptoe into the room until I heard his little breath.
The BHE is a very practical and calm parent, while I am hysterical and overprotective. He likes to note this by saying things like, "When Edwin grows up, his wife might not appreciate you coming into their bedroom every 10 minutes to make sure he's still breathing."