Mac: When you close the lid to your MacBook, your computer automatically goes to sleep. This means you can't continue downloads or perform updates of any kind without leaving your laptop sitting open. NoSleep is a small utility that prevents your MacBook from sleeping when you close the lid.
NoSleep sits in you menu bar and offers a quick toggle to turn it on or off. With NoSleep on, when you close your MacBook, you computer won't fall asleep immediately. You can also set it to never sleep with an AC adaptor connected, or when it's just running off the battery. It's obviously not a setting you need to have on all the time, but it should come in handy for those moments when you don't want to lose your internet connection just because you closed the lid of your MacBook. NoSleep is a free download.