I just got a MacBook about a month ago. This is my first time with macs, I've learned to navigate around pretty good by now. But I'll leave the computer Idle for say 10-15minutes, and I come back and the keyboard and mouse are disabled (ussually one or the other) for a minute until they become functional again? I read you should let your mac sleep rather then turn it off ever session. Also problems with certain websites occur?