system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what is it about long car journeys that makes us so tired?
gpt
You’re sitting there, just staring straight ahead. It definitely makes your eyes tired. Driving is also fairly mentally active as you need to stay aware and watch out for others which is also tiring. There’s also such a thing as being hypnotized by the white lines that split the lanes.