Light from smartphone screens, tablets, and computers has widely been thought to be disruptive to our natural circadian rhythms. Light itself can be a general disruptor of human sleep patterns, but perhaps not in the way that modern devices may have been seen in recent years. How does light affect sleep patterns? The human eye converts light into electrical impulses via a series of cones, rods, and so-called intrinsically photosensitive retinal ganglion cells (ipRGCs). Blue light, which is emitted from devices like smartphones and tablets, is a short-wavelength form of light, and it is converted to the color blue by cones, which respond to bright light rod cells are only operational in low-light conditions and don’t differentiate between colors. Should you avoid using your smartphone before bed the main takeaway from the present study is that more work needs to be done to further pin down which aspects of screens at night time negatively impact our sleep
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