I'm sure I remember that I was always 182 cms without shoes on, but around a month ago I was shocked to see that I am now only 179 cm. I've read that this is possible with a Vitamin D deficiency. I tend to avoid the sun as much as possible (because I can't wear sunscreen on my face) and have been reluctant to supplement with Vitamin D because it seems like every time I do my sleep is horrible (I might be wrong about this). Is it possible to lose 3cms in height over the course of one year? Could a Vitamin D deficiency cause this?