This is ALWAYS happening to me, and I have gotten no answer as to why it happens or how to stop it. I know it happens for 3 reasons; my optical drive makes a wicked noise upon waking from sleep, I'm always connected to iChat so provided we're somewhere near wifi, it tries or sometimes has connected and logged on, and on one occasion I had music start to play. I've also found that movement makes it happen. Try this: close your lid let it sleep all the way so the sleep light starts pulsing, then flip your computer via all three axis. One time I was watching a music video and instead of pausing the video, I simply closed the lid and let it pause itself. I made sure my lappy was actually asleep before I put it in it's sleeve, but then upon walking up some stairs, the video resumed playing and I could really just stop and open up my comp to pause it and re-sleep it. I've also had my computer be in sleep upon entering my sleeve, then shut down when I go to take it out, my guess is that it turned on in the sleeve, began to overheat, and shut down prematurely.
Anyone else have similar symptoms?
-Brian