Anywhere in between and there really isn't a way to prepare fully without PEDs. At least according to the studies.

The advantage for BYU at night has some science behind it. Teams are well outside the ideal 24 hour window for competition unless they fly in day of which we know has other serious drawbacks. altitude also has proven negative effects on sleep during acclimatization. It's just a raw deal all around for low altitude teams coming in for a late night game