At a wild guess, I'd say that the disks got powered down but the OS/computer never properly did.

Take a look again, if I am reading that right it took almost 6 minutes to spin up the disk. Sounds like bad hardware to me. Anyway, if the drive routinely takes that long to spin up maybe that is what is causing the crash when it wakes up. Have you tried doing a drive check by hand? Boot single user by holding down 's' when the computer starts up and when you get a prompt do '/sbin/fsck -f /'.

-Mike