How to Use the Bedtime Device Limit Calculator
Blue light from phone and laptop screens is one of the most common reasons people take longer to fall asleep -- it suppresses melatonin production right when your body should be winding down. Enter how long you typically use devices before bed and how long it usually takes you to fall asleep, and this calculator estimates how much faster you could fall asleep -- and how much your sleep quality could improve -- by cutting off screens 1-2 hours before bedtime.
Blocking devices for a full 2 hours produces a bigger improvement than 1 hour, but a sudden habit change can backfire if it feels too restrictive. Starting with a 1-hour cutoff and extending it gradually tends to stick better.
These numbers are estimates based on general sleep research -- your actual results will vary with caffeine intake, room lighting, and your personal sleep habits.
Frequently Asked Questions
No -- even a 1-hour cutoff helps. The longer the cutoff, the bigger the improvement in both sleep onset time and sleep quality tends to be.
Screen-free activities like reading, light stretching, or meditation tend to amplify the benefit of cutting off devices.