--- title: Screens, eyes and sleep — a lesson of Mova's school · trees and pragmatics description: «Screens, eyes and sleep», a lesson of the medicine course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Screens are not poison for your eyes, but when you stare at a game you blink much less, so your eyes dry out and feel tired; looking far away and --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Medicine](https://md.mova.elamur.ai/free/en/corpora/school/medicine/) / Screens, eyes and sleep # Screens, eyes and sleep Lesson 35 of the medicine course of Mova's primary school: 15 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/medicine/35-screens-eyes-and-sleep/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/0/) — Screens are not poison for your eyes, but when you stare at a game you blink much less, so your eyes dry out and feel tired; looking far away and blinking for a moment fixes it. - [1](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/1/) — The real eye worry for today's children is short sight, which is becoming much more common, and studies suggest that time outdoors in daylight, a couple of hours a day, lowers the risk. - [2](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/2/) — Sleep is when your body grows, your brain files away what you learned and your mood resets: children of 6 to 12 need about 9 to 12 hours a night. - [3](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/3/) — A phone in bed steals that sleep: the exciting game, the last video, the bright light, and before you know it it's midnight and tomorrow's maths feels like fog. - [4](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/4/) — Long screen time can mean less sleep, less activity and more tired eyes, though screens aren't always bad and balance matters. - [5](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/5/) — Staring at screens makes you blink less, so eyes get dry and tired, but screens don't permanently damage the eyes. - [6](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/6/) — The 20-20-20 rule says every 20 minutes look at something 20 feet (about 6 metres) away for 20 seconds. - [8](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/8/) — Reading in dim light can make eyes tired but doesn't ruin eyesight. - [9](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/9/) — Research suggests time outdoors in daylight lowers the risk of children becoming short-sighted. - [10](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/10/) — Screens before bed, with bright light and exciting content, can delay sleep, so doctors suggest no screens for about an hour before bed and devices charged outside the bedroom. - [11](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/11/) — Night mode on a phone has not been shown to fix the sleep problem on its own. - [12](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/12/) — Children aged 6 to 12 need about 9 to 12 hours of sleep a night to grow, learn and stay healthy. - [13](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/13/) — Too little sleep affects mood, memory, concentration and growth, and catching up at weekends doesn't fully fix it; sleeping in very late can also upset the body clock, the body's sense of when to sleep and wake. - [14](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/14/) — Nightmares are common in children, are often linked to stress or scary stories, and don't predict the future. - [15](https://md.mova.elamur.ai/free/en/corpora/school/medicine/35-screens-eyes-and-sleep/15/) — Sleepwalking is common in children, happens in deep sleep and is usually harmless; a sleepwalker should be guided gently back to bed, not shouted at. - ← previous: [Exercise and posture](https://md.mova.elamur.ai/free/en/corpora/school/medicine/34-exercise-and-posture/) - next →: [Heart and lungs when you run](https://md.mova.elamur.ai/free/en/corpora/school/medicine/36-heart-and-lungs-when-you-run/) - ↑ back to [Medicine](https://md.mova.elamur.ai/free/en/corpora/school/medicine/)