system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it so much easier to fall asleep in a napping scenario and so difficult to fall asleep for a night's rest?

I rarely nap because I am always so busy throughout the day but when I get the opportunity to I have no trouble laying down and just drifting off to sleep for a few hours in front of the TV. However, when I lay down to sleep at night the littlest noise or thought in my head will keep me awake all night. Does anyone else have this issue and if so, why?
gpt
You take a nap because you are already tired before engaging in the nap. You go to bed at night because you know you need to in order to have enough energy for the next day. So sleeping because you want to vs. because you are supposed to.