Sleeper allows you to set a hotkey which will dim the screen and spin down the hard disk immediately. This is useful if you know you won't be working on your Macintosh for some of time.
In addition to supporting Sleeper's internal dimmer, the hotkey will work with After Dark or any other screen saver that supports the SAVC gestalt selector.
 
Setup
The hotkey is displayed in the box on the lower right of Sleeper's control panel, which is shown above. To change or erase the hotkey, click on the "Set" button. The following dialog box will be displayed:
 
To set a new hotkey, just type the keys you want to use. To keep your old hotkey setting, click "Cancel" with the mouse. To run Sleeper with no hotkey at all, click the "No Hotkey" button.