Keeping a smartphone within arm’s reach at night may seem harmless, but sleep specialists warn it can quietly undermine both sleep quality and long-term health. The culprit is not just late-night scrolling: even a phone left idle on the bedside table can interfere with the body’s natural sleep mechanisms.
Blue light suppresses melatonin, the hormone that triggers sleep
The most direct biological mechanism at play is blue light, the type of light emitted by smartphone screens. Exposure to it during the evening suppresses the body’s natural production of melatonin, the hormone that signals to the brain it is time to sleep.
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