It is not good to sleep on your stomach. Because pressing the heart has a certain influence on the development of the chest, it is easy to block the nose. It is best to sleep on the right side to prevent the eyeball from being pressed when sleeping on the heart. After sleeping, there is usually temporary blurred vision. If this happens for a long time, the intraocular pressure will be too high. Over time, the eyeball will swell and the axial length will become longer, which will lead to high myopia and easily increase the incidence of glaucoma. As for losing weight, I don't think so. I only heard that regular sleep helps to lose weight.