This is silly. Back when I was working and my home course had a pretty useless automated phone in reservation system (I'd sit there hitting the redial over and over for an hour, and by the time I got through the earliest remaining time would be 3 PM ), we used to get to the course at 3:00 AM to be first in line for the walk-on times on Saturday or Sunday. The course used to hold every 4th tee time open for day of play reservations, and they could only be reserved in person. We had a very civilized system. The first car in the parking lot started a list and put his name at the top. He passed it to the next car, who did the same and so on down the line. When the pro opened the shop at about 5:15, the last guy handed the list to him and he called each name in order to choose our times. My buddy and I used to take 2 times (and we always ended up paired with someone if we didn't have four), the first one the earliest we could get, depending on how early we got on the list, and the second one around noon or a little after. We would walk 18 holes, take a break and have lunch, then walk another 18. First tee time this time of year is 5:33, and we tried to get that one.
The point being that to be at the course at 3:00 meant getting up by 2:30, which meant a short night's sleep. I actually found out that I played worse if I had a full night in bed, and I got in the habit of staying up late and getting up early on tournament days.
Now, being hung over is another thing though. My worst round in memory was played with a bad hangover, first round of the '92 club championship. While carrying a 10 handicap I shot 104. Never did that again.