Light stops being the reason for waking up at 5am. The contoured shape sits over the eye sockets rather than flat across the face, so there is room to blink and nothing resting on the lashes, and the outer panel blocks the streetlamp, the hallway, the hotel window or the cabin lighting.
The satin-finish surface stays cool and does not tug at hair, which is the difference between a mask that stays on all night and one that ends up on the floor.