The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
So as we were all told to sit up straight or even better, just stand up straight, and now I'm also telling you to get that visual thing that you're attending to, screen or otherwise, up in front of you, or ideally above you, those things combine to generate maximum alertness.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
if you want to be alert and you want to maintain the maximum amount of focus for whatever it is that you're reading or doing, you want that screen or whatever it is that you're looking at to at least be at eye level and ideally slightly above it.
if you're somebody who sits down to do work and starts to feel sleepy, or simply unfocused, unable to attend to whatever it is that you're doing, I highly recommend that you take your laptop or tablet. [...] And the idea would be to place that screen of your tablet or your laptop or other computer, and try and get it elevated at least to nose level, your nose level, or even higher.
And if you can, try and place whatever it is you're focusing on at least at nose level or above. Try and avoid reclining.