Day 4 - Hibernation

I've not worked too much with Ubuntu today due to spending time at church and with friends. Hibernation is still frustratingly inconsistent - twice today Ubuntu has failed to hibernate, once producing some message about HAL and hibernation and on the other simply showing the unlock screen. About five minutes ago I tried to restore from hibernation, it got as far as the screen with the while line, then everything went blank - nothing. Restarting the computer solved that, thankfully I'd not left anything open. It seems, from my experience, that hibernation is not particularly reliable - unless of course I'm doing something wrong.