[SamPatt]

>Big, structural changes such as better access to affordable healthcare, expanding income-support programs like the child tax credit, and implementing mental-health programs in schools would go a long way to ending the sleep-deprivation doom loop.

Citation needed.

All of these exist in some places and don't in others, in varying degrees, so in theory a study should be able to look at the effects.

[em-bee]

this was my first thought. coming from a country that provides this, and having laws that don't allow you to work more than 48 hours a week (with overtime) helps a lot to make sure that people get enough sleep.