Coty adds that furniture with light-colored fabrics will also help lighten a dark room. "They don’t necessarily need to be white, but you can incorporate a light beige sofa to brighten the ...

On the first night, all participants slept in a very dark room. On the second, half slept with a lighting level of 100 lux, equivalent to keeping a TV or bedside light on or having a bright street ...

But as it gets darker, as the sun sets or you switch off the lights in a room, rods start to take over because they're more sensitive to light than cones are. The rods dominate night vision, while ...