Fluid accumulates into the skin under the eyes as gravity drags it downward whilst you are upright.
So when you lay down to sleep the fluid is able to drain away into the nasal passages.
There are drains that connect the nose and eyes and allow that fluid to move back and forth between wake and sleeps cycles.
Why do we get 'bags' under our eyes when we're tired?
Reviewed by parcelhubkajang
on
November 10, 2014
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