That crawling, tingling sensation under your skin — the one that sends you checking your bed at midnight — has a medical name: formication. During perimenopause, declining estrogen thins the skin, destabilises nerve endings, and disrupts histamine regulation, triggering false "crawling" signals. Cathy breaks down the science and shares what actually helped her — from barrier-repair skincare to the histamine-estrogen connection nobody warned her about.