This happens to me sometimes, usually if I'm not getting enough sleep because of stress. It sounds kind of like a garbage truck when it sets down a dumpster. Al

This happens to me sometimes, usually if I'm not getting enough sleep because of stress. It sounds kind of like a garbage truck when it sets down a dumpster. Always accompanied by a flash of white light. When I was a kid I thought it was aliens because I would fall asleep listening to Coast to Coast AM.