I’ll check when I have a copy at hand. From memory, he says that the “biphasic” sleep where you wake up in the middle of the night for an hour or so has no scientific backing. I think his main evidence for the health benefits of of afternoon naps is looking at the rates of heart disesase in Mediterranean countries as their sleep patterns shift. This doesn’t seem to be particularly rigorous, but I recall the effect size being pretty large.
I’ll check when I have a copy at hand. From memory, he says that the “biphasic” sleep where you wake up in the middle of the night for an hour or so has no scientific backing. I think his main evidence for the health benefits of of afternoon naps is looking at the rates of heart disesase in Mediterranean countries as their sleep patterns shift. This doesn’t seem to be particularly rigorous, but I recall the effect size being pretty large.