I have not had this until today, 3 months I had surgery. I have a titanium screw in my ankle. This morning I thought my exercise bracelet was left on the bed or something because it has a silent alarm to wake you up. This actually woke me up. I even started to try to see if there was a pattern, (like morse code lol)...anyway, I thought maybe the screw in my bone was receiving signals or something lol. Anyone else?