I got hurt by my own blanket

Any science nerds here who can fucking tell me WHY I KEPT HEARING PLASTIC NOISE AND A SMALL LIGHT WHENEVER MY TWO BLANKETS RUBBED EACH OTHER

MF I REMEMBER MY HAIR STANDING UNDER THE BLANKET WHEN I LIFT IT UP ABOVE MY HEAD AND WHEN I MY HAND TOUCHED THE BLANKET I GOT HURT A BIT WTF-

(I have been sleeping with 3 blankets for almost 2 fucking years cause I can't handle the cold, what's worse is that my sister uses only 1 blanket whereas mine is probably thicker with the 3 combined blankets, yes I got hairs on my arms and legs)