I know Hollywood loves to use swift, powerful hits to the head to simulate knockouts in their movies but if you know anything about head injuries, you'll know that chances are that a person wouldn't wake up without severe brain damage. So I'm looking for a more realistic method of knocking someone out for a while. From my own research, I've been looking into sleeper holds. But if these websites are correct, they only keep the victim down for about 10 seconds once the pressure has been released and I needed something that would knock someone out and keep them that way for closer to 10 minutes. I've also considered drugs (chloroform and the like) which is better, but suggests premeditation, which may not be applicable to the scene I'm writing. So I ask anyone here if they know of a method I could use to realistically knock someone out quickly and keep them down for at least 10 minutes? I'd prefer the victim be caught unawares by the assailant so UFC punches to the jaw are out.