Sony VGN-U750P VAIO Read This First Manual page 90

Click Start, and then Turn Off Computer.
In the Turn off computer screen, hold down the <Shift>-key and click Hibernate.
To return to Normal mode, proceed as follows:
Turn on the computer by sliding the POWER switch in the direction of the arrow or pressing the STANDBY button.
The computer returns to its previous state.
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If you slide and hold the power switch for more than four seconds, the computer will switch off automatically.
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If you do not use the AC adapter for a long period of time, put your computer into Hibernate mode. This power saving mode
saves you the time of shutting down in the normal way.
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When the computer is in Hibernate mode, you cannot insert a disc.
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Hibernate mode requires more time than Standby mode to be activated.
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It takes more time to return to Normal mode from Hibernate mode than from Standby mode.
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Hibernate mode uses less power than Standby mode.
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Do not move the computer until its power indicator turns off.
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Using your VAIO computer