What’s on the Screens & Sleep poster
Light against Content and timing, side by side.
- Light: Bright light suppresses melatonin
- Light: Screens are far dimmer than daylight
- Light: Night mode reduces blue, not brightness
- Light: Effect is real but modest
- Content and timing: Engaging content delays going to bed at all
- Content and timing: Social and work content raises arousal
- Content and timing: Notifications interrupt after sleep onset
- Content and timing: Effect is larger than the light
- The main mechanism is displacement and arousal, not the light itself. Setting a stop…
A phone in another room removes both mechanisms at once, and removes the middle-of-the-night check as well.
Questions about the Screens & Sleep poster
- What’s on the Screens & Sleep poster?
- Light against Content and timing, side by side. Light: Bright light suppresses melatonin; Light: Screens are far dimmer than daylight; Light: Night mode reduces blue, not brightness; Light: Effect is real but modest; Content and timing: Engaging content delays going to bed at all; Content and timing: Social and work content raises arousal; Content and timing: Notifications interrupt after sleep onset; Content and timing: Effect is larger than the light; The main mechanism is displacement and arousal, not the light itself. Setting a stop…. A phone in another room removes both mechanisms at once, and removes the middle-of-the-night check as well.
- Who is the Screens & Sleep poster for?
- Screens & Sleep belongs to the Body & health section rather than to a school year, because health is not something one grade owns. Anyone learning sleep & mind can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Screens & Sleep poster?
- Content keeps you awake more reliably than light does. Both matter; one matters more. A wall chart earns its place by being glanceable from where the work is happening, so Screens & Sleep belongs on the wall where that health work actually happens, within glancing distance, rather than filed away.
- What other posters go with Screens & Sleep?
- Attention, Breathing Techniques and Burnout sit alongside Screens & Sleep in the Body & health section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.AttentionBreathing TechniquesBurnout
- Is the Screens & Sleep poster free to download and print?
- Yes. Screens & Sleep downloads as a free PDF with no account, no email and no watermark, like everything else in the Body & health section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Screens & Sleep poster print at?
- Screens & Sleep is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Screens & Sleep loses nothing.Printing guide
Related posters
Charts that sit alongside Screens & Sleep on the same wall.
Browse every Body & health poster, or start from the full catalogue.