What does, doesn't happen in sleep mode?

I suppose I could try a lot of things to get my answer, but posting iseasier. I'd like to know exactly what happens and doesn't happen when my laptop with Vista Home is in sleep mode. I know it saves energy, but do things like automatic updates, real-time virus protection, e-mail messages--in short, stuff that happens when not in sleep mode--take place? Thanks.

 

If you schedule a task it will wake up..

 

Also, sleep/hibernate uses as much hard drive space as the RAM that you have installed to save the state in hiberfil.sys I just mentioned this in case you think you're missing HD space when space is getting tight and you're looking to free some space up.

 

What such of task are you talking about?

 

Thank you.