it's hard for me to get past the sleep advice, it sounds misguided at best. Sure there are studies if you google oversleeping, they define it as sleeping over 9 hours a night and it sounds it usually is associated with low quality sleep. The core issue is what is causing low quality sleep, oversleeping is a symptom to compensate, and it doesn't sound like 7 to 7 and a half hours is the sweet spot, it's 7 to 9 according to the National Sleep Foundation Guidelines[1].