Why Is It Harder To Sleep As You Get Older?

The primary cause of difficulty with sleep is a phenomenon called chronodisruption, caused by insufficient light in the day and too much light at night. The circadian system regulates every aspect of sleep, from when one becomes sleepy to how deeply one sleeps. Though everyone’s natural bedtime varies slightly from person to person, studies have shown that everyone needs roughly the same amount of total daily sleep—and even more important, has a natural window for sleeping each night
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When this normal circadian rhythm gets disrupted—when people do not get close enough to 12 hours’ worth of sunlight during the day and/or too many blue-spectrum lights at night (as well as any other disruptions) —the brain doesn’t produce melatonin.

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