Our perception of time speeds up as we get older. It also speeds up when we’re in an accident (everything seems to move in slow motion).
Here’s another thing that surprised me even though it was published in 1935. Dr. Hudson Hoagland’s wife was sick with influenza. He noticed that time seemed to pass slowly for her when she was running a fever. She was agitated because in her mind he was taking too long. However, in his mind, he was really pretty quick. He asked her to count to 60 at the rate of 1 count per second and timed her on a watch. In her fevered state, she was done in 37 seconds. During the course of her illness they repeated the experiment at different temperatures, and discovered a linear relationship between the count and temperature:
