How do you prevent a sufficiently motivated teenager from stealing a credit card out of your wallet while you're asleep? I know someone who legitimately has to

How do you prevent a sufficiently motivated teenager from stealing a credit card out of your wallet while you're asleep? I know someone who legitimately has to stash their wallet under their pillow at night. It's very easy to judge from a distance, but kids are smart and people usually aren't prepared to or in the habit of being that defensive inside their own home.