1. Your commute is easier.
If you drive, there is significantly less traffic early in the morning. If you use public transportation, you may actually be able to find a seat before rush hour begins!
2. Your morning coffee is fresher.
The later you come in to work, the more likely it is that the coffee has been brewed and sitting for awhile. Getting to work early means making coffee (people will love you!) and having the freshest first cup of the day.
3. The refrigerator is all yours.
Office fridges accumulate so much food so quickly that putting your lunch in sometimes feels like playing a game of Tetris. When you arrive early, you get first dibs on a nearly empty fridge, so you don't have to stuff your food in some corner and find it squished and leaky when you go to eat it later.