Comment 4 for bug 1022092

http://askubuntu.com/questions/67130/sony-vaio-fw350-reboots-instead-of-waking-up-after-sleep-suspend

The fix provided in this link solved my problem:

    You just have to edit the /etc/default/grub file:

    gksu gedit /etc/default/grub

    Look up the line where it says:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

    and change it to:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_sleep=nonvs"

    Save the file and close gedit.

    Update the GRUB menu:

    sudo update-grub

    Reboot and enjoy!

Is the workaround...