Some computer manufacturers also include a sleep mode in their laptop and desktop machines. Windows 8 and Windows 8.1 have this mode, which is enabled by default. Most computer operating systems have a sleep mode. When you press a key, the computer wakes up within seconds and you can continue using whatever search engine or resume working where you left off. It kicks in after a period of inactivity on your computer or when you select the sleep mode.īefore going to sleep, the computer stops non-essential activities and stores information about any open applications or documents in memory. The sleep mode is designed to save energy and battery life when you are away from your computer for a short time.