When do college students study?

I'm confused.  I was admittedly a slacker when I attended college.   I was fond of hanging out, drinking beer, and playing bridge with my friends.  Dating guys.  But I still had to study, pass exams, and write term papers.  Students at the time had sex, just like they do today--well maybe not that much--but we did in before 10 o'clock and never complained.  Or we stayed out past curfew and were helped to sneak into the building by confederates.

From what I read on the Internet, the average college student is having sex at all hours of the day and night, sober, or more likely, drunk.  Complaining, protesting, picketing, raping or being raped, making rude remarks to faculty and guest speakers, or being insulted.  Sending obscene texts to other students whom they fancy on their expensive cell phones.  Protesting when the recipients of the texts take them up on their texted suggestions.

How do they ever study?  What happens when their French professor schedules a pop quiz?  When do they have time to prepare term papers?  Why do they get all As when they are drunk, stoned, protesting social injustice, or preventing invited guests from speaking all day long?  Or painting obscene remarks on college property?  Or being so hurt and aggrieved when they encounter someone who thinks differently that they need a safe space?