Thunder and/or Lightning

When my brother was a boy, he had an intense fear of thunder or lightning,or both. Usually at the first sign of a storm, he would disappear into his bedroom, and pile all the blankets and covers on top of him, even if the weather was very warm, which it often was during those summer storms. If the storm struck suddenly, catching him downstairs, he would go into the deep closet underneath the stairway, and re-emerge after the storm was over. My mother used to tell him that he'd suffocate from the heat, but of course that didn't happen.