Some people report loud static noises, buzzing, bells, loud crahing, and explosion sounds while asleep or in dreams. You could have exploding head syndrome. The hardest part about it is believing that there is a syndrom called "exploding head" Nothing to worry about. Its not serious. Sleep deprivation and stress are the triggers. They may even trigger small seizures in the brain. Once again related to sleep and stress. I've been having them for about 22 years now. Its annoying!