How to Turn Off Sleep Mode
Sleep mode is a computer component that allows you to save power especially when using laptops. Using this feature is totally dependent on your preferences and usability. Once enabled, your operating system goes into a low power mode without shutting down. The screen and hard drive are usually switched off. If you are not interested in using sleep mode, disable it whether your are using Windows 7 or Mac OSX.
Windows 7 Users
Click the power icon on the system tray on the taskbar, and then click "More Power Options." A new window will launch.
Click the "High Performance" radio button under "Hide additional plans," and then click the "Change Plan Settings" link. A new window will launch.
Click "Never" in each of the categories next to the following drop-down boxes -- "Turn off display" and "Put the computer to sleep."
Click "Save changes." Sleep mode is disabled.
Click the "Apple" icon in the upper right corner, and then click "System Preferences."
Click the "Energy Saver" button. A new dialog box will launch. Click the "Battery" tab, and then uncheck the "Put the hard disk to sleep when possible" check box. Drag the "Computer Sleep" slider to "Never."
Click the "Power Adapter" button, and then drag the "Computer Sleep" slider to "Never." Close the Energy Saver dialog box to save your changes.