Prima o poi doveva accadere. Sull’iPad, ci scommetto, nasceranno tonnellate di leggende metropolitane. Si comincia con questa (come dire) di fonte autorevole. Scrive il Los Angeles Times che usare l’iPad prima di andare a letto toglie il sonno. Secondo alcuni studiosi, l’esposizione allo schermo retroilluminato inibisce la secrezione di melatonina. Per legge un libro, meglio un e reader o la cara vecchia carta.
The difference? Devices like the Kindle, the Nook (the top part of the screen that displays books) and popular e-readers from Sony use a technology called e-paper. It simulates the look of an actual printed page and does not emit light. That means, unlike the iPad, you can effectively read in direct sunlight. (Beach, anyone?)
The iPad, however, contains a touchscreen liquid-crystal display that, like computer screens and television sets, emits light. On the plus side, you can sneak the device under the covers while your significant other sleeps beside you and flip through a couple pages of a book without a flashlight.
But staring at the screen before bed could leave you lying awake. That’s because direct exposure to such abnormal light sources inhibits the body’s secretion of melatonin, say several sleep experts.
If you’ve watched any late-night TV, you’ve no doubt heard the term thrown around in commercials for sleeping pills. Melatonin signals are sent through the brain as a response to darkness, telling the body to prepare to shut down for the night.
Light-emitting devices, including cellphones and yep, the iPad, tell the brain to stay alert. Because users hold those devices so close to their face, staring directly into the light, the effect is amplified compared with, say, a TV across the room or a bedside lamp, said Frisca Yan-Go, director of the UCLA Sleep Disorders Center in Santa Monica.
Visto che sto scrivendo questo post su iPad, mi sento parte in causa e posso garantire che non vedo l’ora di spegnere la luce.