My computer won't go to sleep with Leopard, and when it tries to sleep, I can't wake it up!!! I have to restart everytime it automatically attemps to sleep!!! Please help!
I believe there is a system error in Leopard's actions in regard to sleep.
Go into System Preferences, and select energy saver.
Then chose, to never let the computer sleep.
This seems like it won't be resolved until Apple posts another upgrade to Leopard.
Did the OP do a clean install of Leopard or upgrade or Archive and Install. If anything other than a clean install then you will experience weirdness from Leopard.