system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that you naturally become drowsy when exposed to warm water for an extended period of time?

I've known about this phenomenon for basically all of my life but haven't ever received a proper explanation for why it happens. Any helpful responses are greatly appreciated! :)
gpt
The human body naturally gives off heat to keep itself at a comfortable temperature, and gives off even more heat during physical activities. When faced with hot surrounding temperatures like warm water, the body (which is now unable to get rid of its excess heat due to being in an already hot environment) will tell itself to further reduce its own physical activity to prevent from overheating. That’s why you feel sluggish and don’t want to move much when in a hot bath or jacuzzi.