I don't know why, but after skyping with a friend, or maybe it's just a co-incidence, it now takes forever, or more than 20-30 seconds for computer to go into sleep mode. Before that it was almost immediate, or within seconds the screen would go off and then just a a little more time to enter sleep. Now I enter the sleep mode and the computer stays as is for way too long, and then finally the display goes off and then backlight turns off and then finally into sleep. I reset SMC and repaired permissions, but no result. Otherwise computer works as normal. Any advice on how to repair this or return to original sleep mode timing?