I recently upgraded a couple of my coworkers' 12" PBs with new hard drives and Leopard and also upgraded my 12" PB to Leopard. They are both having problems where their computers will inexplicably go into sleep mode while they are using them - I watched this happen on one computer several times in less than 10 minutes. They seem to start back up from sleep just fine, it's just a bit annoying for the computer to decide to take a nap. Any ideas? My computer is just fine...