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 Windows or 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 condition of Windows, your VAIO computer cannot enter
Sleep mode.

If your VAIO computer enters Sleep mode while running a task, such as DVD
writing, the task may be suspended.

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