It does this every once in a while. It happened twice in the past 2 days. I'm not sure if it's something I left open before going into sleep mode or something else.
So the computer's been in sleep mode, usually for at least an hour. I do the usual thing to wake it up, move the mouse. After a simple movement fails, I try again, moving vigorously and clicking all the mouse buttons. I have also tried pressing all the keys on my keyboard.
None of this works and I have to restart the computer. Any idea why this could be happening?