It should not move too much sleeping as if sleeping on the side we find the mask on the hull front.L'effet no longer comfortable, it is no longer obscuring and it seems to have put mini wonderbra on the forehead! The padding gives warm eyes. Do not wear makeup if too blinkered in insured mascara! Bah it can always scarf ... balls! Or disguise such catwoman! No I exaggerate ... If there had been two elastic as some other masks he would hold up better. We will not shake him to death anyway. It takes the lead I tried. Is its price.