[s1artibartfast]

My point is that a lot of these people are just sleep deprived.

Bob might go to sleep the same time, but maybe he gets 4 hours of sleep a night and operates on a deficit all day.

It's repeatable on a 24-hour cycle but miserable

[pcthrowaway]

Gotcha, that wasn't clear in your earlier comment.

If someone is unable to get adequate sleep on a 24-hour day due to their circadian rhythm misalignment then I believe this is non-24 even if it's because they wake up too early rather then go to sleep too late when trying to keep 24-hour days.