Put Display to Sleep With Alfred
Buh-Bye is an Alfred extension that allows you to put your display to sleep.
You’ll need 2 things for this to work:
- Set your top-left hot corner to put the display to sleep.

- And the Alfred Powerpack.
Install the plugin by double clicking the icon. Invoke by typing bye.

It works by executing an apple script originally found at http://hints.macworld.com/article.php?story=20100418152304108.