“The juxtaposition of a high-tech Japanese toilet in an authentically grimy bathroom has to be seen to be believed,” he writes.
I do have an objection to that, which is that you can find plenty of “authentic,” though perhaps not often grimy, Japanese toilets in modern Japan today.
The more you sleep, up to some limit (maybe 8 hours, maybe 12 hours, maybe 17 hours), the more effective you are when you are awake. I wonder if there is an “optimal” amount of sleep to awake ratio depending on what your daytime activities are. For professional athletes (though it would depend on their sport), perhaps the optimal sleep : awake ratio is higher than average. For intellectual activities (though this would also depend on what kind of intellectual activity: logical, creative, using knowledge you already know, or learning and then using knowledge that you never knew before), I wonder what the optimal ratio is. (Of course there would be individual differences, but let’s say we can average those out.)