Centuries ago, our ancestors relied solely on the sun and fire to illuminate the space around them. This was conducive was regulating their circadian rhythms naturally. Conversely, modern technology has pushed society indoors, which means more exposure to junk light and chronic sleep problems. Too much light, especially at night time, prevents your body from producing melatonin naturally, which, in turn, makes it more difficult to fall and stay asleep. Redder (warmer) lighting is more appropriate to use in the hours leading up to bedtime because it is closer to the natural light spectra at dusk. This lighting promoted better, deeper sleep.