Pretty much as in the title, why I choose Hibernate over Sleep and how to activate the Hibernate setting. A few times, while in sleep mode, my desktop pc did a 'frozen' wake up by itself without the cooling fans running, so the computer overheat. Once I started using the hibernate mode, the computer never woke up by itself and all was fine ever since. Hibernate is also useful in case of a power outage - the comupter will restart from where it left