As a hair care expert with years of experience in the field, I can tell you that getting gray hair overnight is not a common occurrence. Hair color is determined by the presence of melanin, which is produced by cells called melanocytes. The process of hair turning gray is a gradual one, as the melanocytes decrease in their ability to produce melanin over time, typically due to aging or certain health conditions.

However, there are a few scenarios where hair might appear to turn gray or white overnight, but these are not due to the natural aging process. For example, a condition called canities subita, which is extremely rare, can cause hair to turn white suddenly. This can be triggered by severe stress or trauma, but it's important to note that such cases are not well-documented and are considered quite exceptional.

In most cases, the transition to gray hair is a slow process and does not happen overnight. It's also worth mentioning that the age at which people start to see grays can vary widely, influenced by genetics, health, and lifestyle factors.

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These are the sorts of things that can make your hair turn gray overnight. Actually, it's impossible for hair to completely change color overnight. Hair color comes from a pigment called melanin. ... The phenomenon of suddenly going gray due to stress has more to do with hair loss than with actually losing color.read more >>