Coffee

Locations
Coffee can be found along with Hot Chocolate in Coffee Machines, which are found in all laboratories, and also next to many computer offices.

Replenished Stats
Coffee is quite an interesting item. Despite only showing two background colors, it actually fills three Stats: Sleep, Food and Mood, the last of which isn't shown on the icon. However, most of these increases are rather tiny, with the only somewhat noticeable one being Sleep, which goes up by a small bit when consuming coffee.

Tips
To get the best out of coffee, you should drink lots of it, along with a sandwich every once in a while (due to coffee's Food refills being so low), along with some work and dancing in between and frequent trips to the Toilet. Even when using these tips, it is still not worth it to drink coffee, accept in emergencies. Instead, you should just keep a sandwich handy at all times.