Remember how you learned that 縛る means "to bind?" Well, in Japanese being bound by gold means you're experiencing sleep paralysis, or temporary paralysis. Just imagine that you're waking from a dream where you're bound up in gold thread, and it's stopping you from moving.
This is a combination of the words 金 and 縛る. Both use the kun'yomi readings, but 金 becomes かな instead of かね. If you can remember that exception, this should be easy!