Sleep time changes - is this a problem? I have a new 27" iMac core i5 Everything works well. I typically do not turn it off instead I put it to sleep. 95% of the time it goes to sleep in a second or two. Sometimes it takes about 10 seconds - usually before 10 seconds I try again to put it to sleep so perhaps it actually only takes a couple of seconds still as the 2nd attempt is what works. Waking up is always fast. My questions: 1) Why does this happen? 2) Is it a problem?