Sleepy newborn = easy baby? 🤞🤞🤞

My newborn is 9 days old and has pretty much slept all day, every day since she got home (except for the middle of the night, of course) and it's so radically different from how our first was that I keep finding myself waiting for the other shoe to drop, so to speak. For those of you who had a very easy/sleepy newborn, did they stay that way, or is she going to wake up any day now and become the demon fuss monster that her brother was his first few months? (Don't get me wrong, he's the light of my life but he was NOT easy as a newborn.)