Their findings, published today in the journal Scientific Reports, show that students whose circadian rhythms were out of sync with their class schedules – say, night owls taking early morning courses – received lower grades due to “social jet lag,” a condition in which peak alertness times are at odds with work, school or other demands.

Source: Poor grades tied to class times that don’t match our biological clocks | Berkeley News

And I also found out that night owls have a higher risk of dying early.