Does Screen Time Before Bed Really Affect Your Sleep?

Screen time before bed may interfere with sleep quality or duration, although its effects vary by person, device use, and the type of content viewed. Light from screens in the evening can suppress melatonin and may shift sleep timing, especially when exposure is bright or prolonged. The effect depends on factors such as screen brightness, distance, duration, and individual sensitivity. Interactive, stressful, or emotionally engaging content may increase alertness and make it harder to wind down. Some studies link screen use near bedtime with taking longer to fall asleep and getting less sleep, but the size of the effect varies across studies and individuals. For better sleep hygiene, consider reducing screen use during the hour before bed, dimming the display, and choosing calming activities. Blue light filters may reduce some evening light exposure, but they do not remove the alerting effects of engaging content.