question: Hello, my problem is the following: since last June,every time I don't wash my hair at night,the following day a large amount of hair falls out.I notice it on the pillow and in the bathtub when i wash it. It only happens when I do not wash it(when i do, there is absolutely no hair on the pillow ) and it just falls the day after, then it stops.I also have to say that since the beginning of the summer it has been very greasy.             Does it fall because of sebum?How can that happen in just one night?Is it the hair or the follicle that dies so suddenly?Won't it regrow?