What is the effect of engagement with smartphones on sleep?

What is the effect of engagement with smartphones on sleep?

• A. Exposure to blue light affects sleep quality
• B. Increases sleep duration
• C. Improves REM sleep
• D. Has no effect on sleep

Answer: (A)

Engagement with smartphones primarily affects sleep through exposure to blue light from screens, which suppresses melatonin and shifts the circadian clock. This makes it harder to fall asleep and can reduce the overall quality of sleep, leading to lighter, more fragmented sleep and less restorative REM and slow-wave sleep. So the statement that blue-light exposure affects sleep quality captures the real biological impact, rather than suggesting more sleep or better REM, or claiming no effect. Additionally, the tendency to stay mentally engaged with notifications and content can further heighten arousal, making it harder to wind down. To mitigate this, reducing screen time before bed or using blue-light filters can help improve sleep quality.

Engagement with smartphones primarily affects sleep through exposure to blue light from screens, which suppresses melatonin and shifts the circadian clock. This makes it harder to fall asleep and can reduce the overall quality of sleep, leading to lighter, more fragmented sleep and less restorative REM and slow-wave sleep. So the statement that blue-light exposure affects sleep quality captures the real biological impact, rather than suggesting more sleep or better REM, or claiming no effect. Additionally, the tendency to stay mentally engaged with notifications and content can further heighten arousal, making it harder to wind down. To mitigate this, reducing screen time before bed or using blue-light filters can help improve sleep quality.