I don’t wanna sound like a wiseguy or anything, and I’m probably not the first to think of this, but I think I figured it out:
I think that how fast time moves is relative to how much you think. Like, the ‘speed of thought.’ Everything is relative (is viewed in a context), and basically you have to filter all of your experiences through your mind in order to even experience them, so from the inside looking out, the whole world is in your mind (“it’s all in your head”). If you’re stumped on a problem or worrying about something, time may pass very slowly whereas if you’re just having fun and just enjoying the moment, or to exaggerate, if you’re sleeping, then time will pass very rapidly. If you dream than you spend more time being asleep. Thinking more slows down time whereas simply reacting skips over time. People have said regarding crazy moments that “it was like slow motion. I never thought it was going to end.” And conversely there exists “driving hypnosis” where you end up at your destination in the blink of an eye because you are so used to taking the same route that you require zero thought to drive it. This line of thought leads to the creation of memories as what allows us to place ourselves in time. Without any memories, there is no time. Babies do not have memories, and thus have no concept of time (and aren’t really much alive yet, like, viva la vida etc…). And they are also really stupid. But on the other end of the spectrum you might have someone with Alzheimer’s who does not have the ability to create new memories, and is, although it’s painfully sad to say, pretty much already dead (from their point of view). So the next time you fall into routine, or order the same thing for lunch, or drive the same way home, or do the same activity with your friends — stop… and think about that.
Make a memory.
EDIT (3/16/14): I came across this video that has a much more informed position than my generalized curiosities. It’s a fun watch if you have a few minutes, however the title is a bit misleading…
allmostrelevant 
