If someone could observe our nighttime routines for a week, and tell me what is different on the nights when Pumpkin sleeps well (defined as waking only once to nurse, and then sleeping until at least 6 a.m.) versus the nights when she does not sleep well (defined as several periods of wakefulness, perhaps with some unexplained screaming and a refusal to allow Daddy to calm her, followed by waking up at 5:30 a.m. or earlier), I would be very happy.
As it is, I suspect we are looking for a pattern where none exists, and are actually at the whim of random luck. It is a bit like sleep roulette. I go to bed, never knowing how long I'll get to sleep.
So maybe what I need is a sleep charm? Or some superstitious system by which I try to guarantee a good night?