What is the difference between sleep and hibernate?
Hibernate. Hibernate mode is very similar to sleep, but instead of saving your open documents and running applications to your RAM, it saves them to your hard disk. This allows your computer to turn off entirely, which means once your computer is inHibernate mode, it uses zero power
PC Sleep is a windows sleep timer. It's dedicated program on Windows. PC Sleep will give you additional options, such as the ability to log out, hibernate, set an exact shutdown time or shut down after a length of inactivity.
Read more: CNET write about PC Sleep