Everyone has limits. After 3 weeks, I think I hit my crash-point. 6 hours of sleep a night. If I try to nap in the afternoon, I see numbers and equations. First serve%, hard or clay, men's or womens, collapse effects, ack!
Grab yourself a Pilsner Urquell, and enjoy this video if you have no expectation. And in 8 hours, it is back to the grind. NCAAF starts in 2 days.