Beating faster than a hummingbird's.
Was just having a dream* I was in the middle of a plane crash, it had just hit the ground and was in the midst of breaking apart as It tore across the ground, when my alarm, clock -- which itself is basically an explosion of static and beeping.
I almost had a real-life heart attack!
*It should be noted I've had this dream before, and it's more from the vantage point of a Hollywood blockbuster, and while the crash itself catches me by surprise every time I wouldn't classify this as a nightmare because -- as the vehicle is breaking up and tearing along the ground -- I know the very next scene will involve me waking up in a hospital room miraculously unscathed. This is why I suspect the intruding sonic stimulus from the real-life waking world scared the licing fuck out of me.