&gt; even something most doctors would recommend!<p>Find me a doctor that will recommend you sleep fewer than 7 hours with a straight face. Because to get up at 4 they have to be getting to bed at 21.00 at the most and I very much doubt that, even for people without a social life.<p>&gt;  They mention a CEO who, while exercising, &quot;looks at e-mail, surfs the web, watches tv&quot; [paraphrase, not direct quote]. No kidding, everyone does that! There&#x27;s music playing in the gym, there are TVs in the gym, and who the hell doesn&#x27;t glance at their phones to check emails once in a while? This literally describes the behavior of 90% of the people at the gym.<p>If you&#x27;re able to read, talk or otherwise focus on other tasks you&#x27;re not exercising anywhere near hard enough to make it worthwhile.