| Re:Blaulicht bei Smartphones |  |
Hatte dazu mal vor einiger Zeit einen interessanten Artikel vom NewYorker gelesen:
[https://www.newyorker.com/science/maria-konnikova/why-cant-we-fall-asleep]
Auszug:
" Now, however, that natural prediction system is being constantly wrong-footed. The problem isn’t just artificial light in general. Increasingly, we are surrounded by light on the short-wave, or “blue light,” spectrum—light which our circadian systems interpret as daylight. Blue light emanates from our computers, our televisions, our phones, and our e-readers; ninety per cent of Americans use electronic devices that emit it. When we spend time with a blue-light-emitting device, we are, in essence, postponing the signal to our brain that tells it that it’s time to go to sleep. (“What have we done with our dusk?” Charles Czeisler asks.) When “dusk” gets pushed progressively later because of these false light cues, we get a surge of energy rather than the intended melatonin release.
Czeisler has found that artificial light can shift our internal clocks by four or even six time zones, depending on when we’re exposed to it. In one study, out earlier this year in the journal PNAS, Czeisler and his colleagues asked people to read either a printed book or a light-emitting e-book about four hours before bed, for five evenings in a row. The effects were profound. Those who’d read an e-book released less melatonin and were less sleepy than those who’d read a regular book; their melatonin release was delayed by more than an hour and a half, and their circadian clocks were time-shifted. It took them longer to fall asleep. The next morning, they were less alert. These resetting effects can result not just from prolonged reading but from a single exposure. In his sleep lab, Lockley has seen it happen after exposing subjects to short-wavelength light for less than twelve minutes."