Have you ever stayed up scrolling, only to feel wide awake long after? Blue light may be to blame. Natural blue light helps regulate our body clock, but at night, artificial sources from phones and screens suppress melatonin, delaying sleep. Dr. Keshav Narain of South Bay Retina notes this disruption can cause restless nights and next-day fatigue. Protect your rest by reducing evening screen time, using night mode, or wearing blue-light-blocking glasses.