Has anyone seen anything similar to my problem? When I hit the sleep option on the blue apple sign nothing happens for about 30 seconds and then it sleeps instantly. Waking up is instantaneous. My machine is an Intel iMac with 1.5Gb RAM. Up until a few weeks ago it slept the instant I selected the option, and just after the reboot when I installed 10.4.8 it slept properly but since then it is back to the slow sleep. I have tried closing all the apps down before sleeping but that made no difference. Anything else I can try?