The light gradually increases in strength over a 40 minute period, and says that it allows the user to set their circadian rhythm, meaning that the user goes through the 5 stages of sleep before it starts working. It should, as result, allow the user more restful sleep, and a less stressful awakening, transferring over to less stress during the day.
The pillow is charged by induction, so it isn't tethered down by a cord. We think we'd have to test this on weekends to make sure we'd wake up by it when we need to...and in any case, it would force us to get more sleep to make sure we'd get up in the morning if we need to rely on it to wake us up at a reasonable hour.
Originally sighted on GeekSugar.