Question: how come we jump when we dream we're falling?

Pete Etchells answered on 5 Jul 2012:

We might not always! I think dreams like this always are particularly memorable if they occur towards the end of your sleep, when you are in the stages of waking up. At this point your brain starts to engage your muscles again, and if it’s a natural or automatic thing to jump when you’re falling, then your leg muscles might spasm involuntarily. A sudden movement like this might wake you up, so you’d be more likely to remember it all happening.