Blue light boosts alertness. It may suppress production of the 'sleep hormone' melatonin. It turns out that special photoreceptor cells in the eye respond sensitively to blue light and influence the body’s circadian rhythms.
It's the summer solstice in the northern hemisphere – the longest day of the year, but also the shortest night. That's a downer considering how great sleep is. So don't nod off 'til we tell you how to improve your z's.
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