I don’t even know what happened

Date: 11/27/2017

This wasn’t a dream, but I slept really weird and I woke up (while still half asleep) to the faint sound of a video of some kind of lecture maybe. I think that happened twice then the third time I woke up (while still half asleep) I heard classical music playing. I was sure it couldn’t be my computer because it was off, and it couldn’t have been either of my parents because I went to sleep at 1:30 in the morning and they’re usually asleep by 11. I don’t have an explanation for this... I’m so confused... do any of you have any idea what could’ve happened?