My 9 week old hardly napped at all yesterday and had a very restless night. He’s now been asleep pretty much continuously from 6pm to 12am which isn’t normal for him, he’s only woken once for a feed. He’s now roughly 1.5 feeds behind based on the amount of milk he’s normally had by this time of day. I’ve tried waking him to feed but he immediately falls back asleep again. Is he just catching up on his sleep or should I be worried? He’s otherwise fine, no fever or anything