<prompt> Going white overnight, is feature of:VitiligoAlopecia areataAnagen effluviumAlbinism  <response>: Ans. b. Alopecia areataAlopecia areata typically spares white or grey hair.Hence, if alopecia areata progresses rapidly; it will lead to this phenomenon called going white overnight as in a person with a mixture of grey and pigmented hair only grey hair is spared. 