The Economic Times

Psychology says people who can't sleep with light on aren't simply following a bedtime preference: What the behavior reveals?

Psychology says people who can't sleep with light on aren't necessarily afraid of the dark. The habit may relate to sensory processing, safety, control and the way the nervous system responds to environmental signals. Some people need complete darkness before they can relax, while others prefer light. Psychology suggests that sleep habits can reflect how the brain manages alertness, vulnerability, stress and the need for predictable surroundings.