There is an abundant and growing body of
evidence that nighttime exposure to artificial
light can be disruptive to sleep. Light
exposure may delay the onset of sleep and
may also compromise sleep quality. Light
comes in different wavelengths. Sleep scientists
are discovering that different wavelengths of
light can have varying effects on sleep and
alertness. Blue wavelength light has been
identified as being especially disruptive to sleep.
Research indicates that blue wavelength light
may exert a stronger influence over the body’s
circadian system, which plays a critical role in
regulating sleep and wakefulness. Nighttime
exposure to blue light has been shown to
stimulate alertness and delay sleep