Also during the water metabolism, if you drink plenty of water before going to bed, the amount of waste water is not recovered smoothly will be deposited in the vasculature, not only causes swelling.
If more serious it also causes the cell can not absorb oxygen, nutrients, and new water, resulting in your dark skin.
For people whose faces are swollen, their appearance will not be bright when they get up, or after waking up a few hours it can be bright.
Drinking plenty of water before bedtime can lead to swelling but you should not skip drinking before going to bed, you should drink enough water for body to absorb the best.
By: Anna Lee