It could wake on a mouse move or a programming bug. Not much of a mystery here, but an annoyance.
Last night, I pressed pause on an Amazon Prime video I was watching, then closed my computer and went to bed. At around 5:30 in the morning, I woke up to the sound of the show I was watching. My computer was still closed, but the audio was on. I opened my computer and found that the video was on Play. How does something like this happen? Is this a weird glitch or something more serious I should be worried about?