Indeed. AFAIK the psychological definition of burnout is something that you never bounce back from (to the same level). Something that you bounce back from is

Indeed. AFAIK the psychological definition of burnout is something that you never bounce back from (to the same level). Something that you bounce back from is 'just' exhaustion – and burnout is something that happens when you're exhausted but still keep pushing. It's interesting how the author first uses sleep as an example of leisure, then something as akin to 'work' (before play), because undersleeping is pretty much the typical example of the kind of short-time 'benefit' thing that leads to very high long-term costs. But I guess that the first mention of 'sleep' might have meant "staying lazily in bed when you have already woken up" ?