system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we train ourselves to control our bladders while asleep?
gpt
Very basic answer before somebody comes along with a huge answer.

The sphincters in your anus and along the urine path are a type of muscle that are contracted until they are relaxed. An always closed until open type of deal. Therefore, until you relaxed the pipes are shut.