Q Does looking at my smartphone really make it harder to sleep?
A Yes—blue light suppresses melatonin and the stimulating content heightens brain arousal, delaying sleep onset by an average of more than an hour.
Detailed Answer
The blue light (460–480 nm) emitted by smartphones and tablets stimulates the ipRGC cells in the retina, sends signals to the suprachiasmatic nucleus (SCN), and suppresses melatonin secretion. Studies show that smartphone use 1–2 hours before bed delays sleep onset by an average of 50–90 minutes. Stimulating content (social media, short-form video) also promotes dopamine release and raises arousal.
Korean Medicine Clinic Perspective
At Dongjedang, we present turning off digital devices one hour before bed as the first principle of sleep hygiene. Instead, a warm foot bath (38–40°C for 15 minutes) increases peripheral circulation and lowers core body temperature, helping induce sleep along with its spirit-calming (ansin) effect. For working adults in the Dong-gu and Dongincheon area of Incheon, excessive smartphone use after work is confirmed to be a major trigger.
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