We all know that, when winter hits, it can be a tough time to keep working. It’s dark when you wake up, cold when you go outside, sweaty when you take off all your layers, and miserable when you catch someone else’s germs. But even though your hours of daylight are shorter, neither your boss nor teacher is going to accept lousy work. You have to cram in just as much efficiency as you would any other season. So how can you continue to be productive? Here are five tips. 1) Slee