Phone screens before bed disrupt brain, experts urge nature‑based 20‑5‑3 rule

Research warns that using a mobile phone or other screens shortly before sleep exposes the brain to blue light, which blocks melatonin production and keeps the brain in a state of alertness. The resulting stress hormone surge (cortisol) and heightened sympathetic activity impair deep sleep, reduce memory consolidation, increase fatigue, and raise the risk of depression.

Scientists recommend turning off all screens at least 60 minutes before bedtime and keeping devices out of the bedroom. In addition, neuro‑scientists promote the "20‑5‑3" rule devised by Michael Easter: spend 20 minutes in a green space three times a week, allocate five hours each month to semi‑wild natural settings, and take a three‑day digital‑detox retreat in the wilderness once a year. This routine lowers cortisol, boosts immune function, improves sleep quality, lowers blood pressure, and alleviates depressive symptoms.