Is there some aspect of this that's quite new? I'm reading Why We Sleep (Matthew Walker), published 2017-09 - an HN recommendation from a while back - and I've

Is there some aspect of this that's quite new? I'm reading Why We Sleep (Matthew Walker), published 2017-09 - an HN recommendation from a while back - and I've just read the chapter where he describes an experiment that sounds exactly like this (as in, same approach, same outcomes).