Electromagnetic (EMF) radiation and blue light both have been shown to delay the release of Melatonin in the brain.
Melatonin is one of the primary hormones responsible for regulating our sleep-wake cycles. Studies have shown EMF radiation and blue light is associated with delayed release of Melatonin, lowered production of Melatonin, less Rapid Eye Movement (REM) restorative sleep, less sleep overall, and poorer quality of sleep. A disruption in sleep makes the body unable to repair its cells and muscles. Short-term memory fails to transfer into long-term memory, and other processes in the body fail to reset.
This could explain why so many wake up feeling unrested, unable to concentrate, and irritable, in addition to experiencing other problems with their body. While high-energy blue light takes half the blame, as it is an unnatural form of light that can affect our circadian rhythm (sleep-wake cycle), studies have shown that EMF frequencies, even with no blue light present, can disrupt sleep.