system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are you woozy and uncoordinated after you wake up in the morning?
gpt
Part of it is melatonin. It breaks down after waking up due to (sun)light, which is why waking up in the dark is harder and usually makes you feel more drowsy at first. Melatonin is responsible, in part, for making you feel tired at night.