Some USB devices may not support Sleep mode. When your VAIO computer
resumes from Sleep mode, the computer may not recognize such USB devices,
depending on the type and number of connected USB devices.
If you cannot place the computer into Sleep mode, disconnect all USB devices
and try again.
If your VAIO computer enters Sleep mode when the computer is unstable, it
may not resume from Sleep mode. The following operations are recommended:

Before placing your VAIO computer into Sleep mode, save your files and exit all

running apps.
Shut down your VAIO computer periodically.

Depending on the current state of Windows, your VAIO computer might not be
able to enter Sleep mode.
If your VAIO computer enters Sleep mode while running a task, such as DVD
writing, the task may be suspended.
Your VAIO computer may become warm during Sleep mode.

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