Sleeper
ONE CLICK, NO SLEEP !!!
What is it ? SLEEPER is a little app that lives in your menu bar. With SLEEPER you prevent the computer from going to sleep without changing the system settings.
How it works ? It’s very easy with SLEEPER to keep your Mac awake when needed. You activate it by clicking on it in the menu bar item.
Congratulations! Your Mac is awake.
Features: - Activate/deactivate with a single click in the menu bar. - Keep your Mac awake. - Choose from numerous activation time presets. - Supports Retina displays. - Supports Dark Mode.
The Sleeper menu bar application is built for one thing in specific: keeping your Mac alive from going to sleep.
Just don't overuse it otherwise it might get edgy. SLEEPER requires OS X 10.8 Mountain Lion or higher.
Download https://itunes.apple.com/us/app/sleeper/id1197999741?mt=12