According to experts, sleep position may contribute to under-eye bags because of gravity. Sleeping on your side or stomach can encourage fluids to collect under your eyes. Side sleepers may notice a heavier bag on the side that was slept on. If you wake up with puffy eyes, try sleeping on your back and add an extra pillow under your head. Sleeping on your back with your head elevated also helps with the puffiness that clients may experience the morning after an eyeliner procedure.