Why does music feel faster and higher-pitched at night, and slower in the middle of the day?

Answer 1

I think it's because your heart rate is faster during the day, and so the music actually seems slow, when in fact it's your body that's running at turbo-speed and the music seems slow in comparison. I notice this when I listen to my mp3 player, it seems slow during the day, but in the morning and at night it is normal, and sometimes faster.

Answer 2

To me, it doesn't