Your mom was right when she told you to get a good night's sleep before your first day of work. You want to be sharp, clear-eyed and preferably awake while you meet dozens of new people, process loads of critical information, choose your network password and figure out the quickest route to the restroom.
But what mom didn't know was that one good night of sleep won't make up for three months (or more) of late nights and afternoon naps. You need to re-train your body to keep regular "working" hours. Experts say this requires two weeks of going to sleep at a reasonable time and waking up unreasonably early [source: Vogt]. Stick to this regimen, and soon your internal clock will jibe with the alarm clock -- give or take three smacks of the snooze button.