Although this could have been easily made part of my 10.5.6 update post, I feel the need to dedicate one post entirely devoted to this matter.
My MacBook Mini lost the ability to sleep, or rather, its ability to wake up from sleep after I updated to 10.5.6.
Initially, on 10.5.5, the HP Mini would obediently sleep and be summoned from sleep but I couldn't adjust the brightness of the screen - it was perpetually set to max, thus causing my batt to drain quicker than I would've wanted it to. The "Fn" combo keys would work only for volume but not for screen brightness. Weird.
My original motive for updating was to finally be able to adjust brightness to save battery life. But now that my machine interprets sleeping as going comatose - it won't wake up and would require me to force power it off - I've been having doubts on whether doing the update and going through all those trouble only defeated my main purpose or were they worth it?