Evening use of screens, room lighting, and handheld devices often increases exposure to short-wavelength (blue-enriched) light at times when many households are winding down. Device settings, apps, and bulbs can change color temperature and brightness, and people frequently experiment with these options based on comfort.
Sleep-wake timing is influenced by multiple cues, including light exposure, meal timing, and routine. Establishing consistent evening habits - dim light, reduced notifications, and a fixed bedtime - are common strategies people use to prepare for sleep, regardless of the specific light sources in their environment.