system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Sleep is good for humans, but why do especially newborns, babies and children then have a hard time falling asleep with lots of crying and obvious resistance?
gpt
Children are constantly growing and learning new things. Those new things excite them and stimulate brain activity. So even though they need to sleep, their brains are hyped up with all this new info so they fight falling asleep. A lot of babies need help relaxing enough to go to sleep, and young children need a routine that signals to their brain it's time to calm down. As adults, we can feel when we are tired usually. But sometimes we feel wide awake when we need sleep, so we take a warm bath, drink hot tea, do whatever we can to get our brains to relax. So it's the same thing.