Is it? I've never found it to be frightening. Of course, I've never slept in a place where I'd be likely to get into my trouble if I wander away from my bed. I got down into the Common Room once, but not into the corridor outside, before Portia came down and woke up.

It's not something I learned, really. It's just something I've always been able to do. Like the way some people can roll their tongue, or fly a broom the first time they get on it, or put their leg behind their head or something.