What should I do if my VAIO computer does not enter Hibernate mode?

• To place your VAIO computer into Hibernate mode, disable Rapid Wake in the Rapid Wake window on VAIO Control Center. [Details]
  If you still cannot select Hibernate mode, click Change advanced power settings in the Power Options window and check if Allow hybrid sleep under Sleep is set to Off. If it is set to On, change it to Off. [Details]