So amidst our 3+ a night wakings, my little guy had what I consider to be an amazing night. He did his usual longer stretch before bed (something newish, not sure if it's OS or what), fell asleep at 7:20, woke at 7:40 (another thing he does, wakes not long after bed), fell back to sleep at 8:20 (after a cryfest and nursing), then slept 5 hours, woke for a feed, the slept another 4, woke for a feed, then slept 1:45 before waking for the day. It felt amazing, despite the quirkiness of the evening leading up to it. But when I tried to reproduce the day and same amount of feedings, etc., we cannot seem to get that great night back! Any ideas why he would sleep so well out of the blue?