Another cause is believing that, in order to compensate for too-short a night, one only has to sleep more the next day, or even afterwards. AFAIK this is false

Another cause is believing that, in order to compensate for too-short a night, one only has to sleep more the next day, or even afterwards. AFAIK this is false, sleep doesn't work this way and we all have to sleep adequately each and every day.