I'm not going to mention any names, but someone who lives in my apartment that isn't me did something rather silly the other night. This person decided to make expensive plane reservations late at night when he was exhausted, and ended up with a big mess. Delta's system wasn't working properly and this person's frustration became more and more heightened, as the system wouldn't accept his credit card. Turns out that the system did accept his card and charged several thousand dollars worth of plane tickets. Of course it's an obvious mistake and he was able to have it handled in an hour, but late Monday night after a holiday weekend is the last time you want to go back and forth on the phone with an airline and a bank.
You're not only less likely to make this kind of irritating mistake when you're more awake, but choosing to make arrangements at a time when you're more focused will likely yield better decisions. With a keener eye, you're less likely to miss deals and you're in a better state to search various travel sites for the best prices. On a happy note, tickets were actually 30 percent less the next night when the tickets were actually booked. Maybe there is some truth to the theory that the best travel deals come along on Tuesdays!