Sony VAIO VGN-NR Series - Manual (Page 85)

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Customizing Your VAIO Computer
If the computer is not used for a certain period of time, it will enter Sleep mode. To modify this, you can change the Sleep
mode settings.
To change the Sleep mode settings
1 Right-click the power status icon on the taskbar and select Power Options.
2 Click Change plan settings under the current power plan.
3 Change the time to place the computer into Sleep mode and click Save Changes.