You probably have heard some popular belief with a supposed scientific base of the type of humans use only 10% of their brains, you can kill somebody dropping a coin from a tall building, hair and nails continue growing after death or water drains backwards in the other hemisphere.
Surely that you have heard more than twenty, but twenty are solely those that a recently published document (a little lacking in references) tries to solve.
On the other hand, Javi Moya (author de Video Downloader), talks (in Spanish) about sleep paralysis which may be the case in opposition to sleepwalking. He previously talked about when you are about to fall asleep and suddenly you jump. It's annoying, isn't it? Don't worry, you are not the only one.
Unfortunately, nobody tells if we can make frogs a la Al Gore.