system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does my bed feel more comfortable in the morning when I wake up than at night when trying to go to sleep?
gpt
Your body produces melatonin while you sleep. Melatonin makes you feel euphoric and sleepy. It helps you sleep and stay asleep. Unfortunately, it doesn't help you get up in the morning. If you wake up before you're fully rested and at normal daytime melatonin levels (e.g. when your alarm goes off), then you just want to sink back into your bed.