SLEEPCOACHGAME · answers

Do screens before bed hurt deep sleep?

Yes. Screens before bed hurt deep sleep in two ways: their bright light delays your body clock, telling your brain it is still daytime, and the content keeps your mind alert when it should be winding down. Both push your sleep later, and because deep sleep is front-loaded, a later, shorter night squeezes it out. It is the light and the alertness, not the device itself.

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Three stacked causes showing how screens before bed hurt deep sleep: bright light delays the body clock, the content keeps you alert, and later sleep means less deep sleep, with a note that it is the light and alertness not the device itself.
Screens delay your clock and keep you alert. It's the light and the alertness, not the device.

How screens do the damage

It is the light and the alertness, not the screen itself.

Evening light delays your body clock. Bright light at night tells your brain it is still daytime, pushing your sleep timing later and shrinking the window for deep sleep (Chang et al., 2015).
The content keeps you alert. Scrolling, messages and cliff-hangers keep your mind switched on when it should be winding down — often the bigger problem than the light.
Later sleep means less deep sleep. Push the whole night later and the deep stages, which are front-loaded, get squeezed out of a shorter night.

You do not have to ban screens — you have to stop them from delaying and over-stimulating you before bed. Dimmer light, calmer content, and an earlier last-scroll do most of the work.

The swap

Catch the screen-light thief.

The phone in bed is one of the most common deep-sleep thieves, and one of the easiest to normalise. SLEEPCOACHGAME shows you 12 real-life scenes in 58 seconds, including the late scroll, you answer Green Light or Red Light, and your AI Coach names the thief your round caught and the swap that gives your deep sleep.

Deep sleep turns waking up into something you look forward to.

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