I just recently purchased a Macbook Pro after running DOS and Windows for 12-13 years. So far I love it, but I am noticing some strange behavior, and I am wondering if it's normal. Basically I never turn off my Macbook because I use it so often at work. I merely close it every night. Most of the time when I open it everything just comes back up the way i left it and I have no problems. Sometimes the macbook is OFF, and I KNOW I had a good charge on it. After it reboots it even said I had more than an hour left on the battery. Anyone else experience this? Other times I get a grey screen and a loading meter. Everything comes up as if I never did anything. Im guessing this is some kind of hibernation mode if I leave the macbook untouched for a longer periiod of time. Im not concerned about this, but are my assumptions correct?