iMac takes 30sec+ to go to sleep..

[myu]

A month or two ago was when the problem started..
It takes 30 - 60 seconds after clicking on apple icon>sleep till monitor turned off and light starts flashing.

Fixed permissions, browser caches emptied, desktop doesn't have that many files/folders on... Don't seem to help anyway. Don't know what else to try..

It is just annoying and not causing any problem at this stage but I don't think it's supposed to take that long to go to sleep, so if there's a way to fix it, I'd love to know.

Thanks.