Is it possible to put a mac to sleep after a set amount of time just as you would do it with a radio?

Is there a "sleep" software for Mac similar to the "sleep" button on a radio which would turn the computer off after a set amount of time ? I like to go to bed with the music on and would love the computer to turn itself off automatically after 30 mns of music. I am familiar with the energy saving options of Mac but would prefer a specific widget or software for this if it exists. Thanks for the answers.|||I use a program called Awaken which has a sleep timer feature like you describe. It also has a few other features like an alarm clock and egg timer. It costs $15. http://www.embraceware.com/products/awak鈥?/a>





Looking around a bit I found a program called Apimac Timer which is free and also sounds like it has the feature you want, but I've never used it. http://www.apimac.com/timer/|||I have found the best way to put a mac to sleep is to pour a glass of warm milk directly into the cd drive.