There is sleep mode, and then there is hibernation mode, Hibernation mode is more like "save state" in games. you can unplug the computer when you hibernate it, and when you turn it on, it goes back to the same state it was in.
That is what sleep mode does though. I was doing that all the time. When you turn the power off though, the peripheral input devices (aka mouse/keyboard) don't wake the computer up anymore when you turn the power back on.
It might have been named differently, but I used everything from Windows 95 through Windows 8 on various devices, and they always only had Standby or Sleep Mode option. They discarded the "Standby" name, because people negatively received it or something. But effectively, the PC is turned off and saves an image of its current RAM state. That's why there could be errors when its turned on again with some programs using consistent RAM access.
I guess your "hibernation mode" is just another name for nearly the same thing made by the computer's manufacturer.
Anyways, going full circle: Don't use applications that you had on before setting your computer into sleep mode, because their RAM access or save addresses might be corrupted, causing them to work very slow or crashing. I am having the same problem with Visual Studio. Games are even more affected by this, knowing their rapid RAM access and rather large amount of RAM they reserve.
