So, you know how sometimes when you drink cold milk it's kind of a shock to your body? Like when you jump into a cold pool and your body gets all like "whoa!" and you shiver? Warm milk is an alternative to cold milk that can help your body feel calm and relaxed, sort of like taking a bath in warm water. Sometimes people drink warm milk before bed to help them feel sleepy and cozy. But be careful not to drink it when it's too hot, like when you burn your tongue on pizza or soup. That wouldn't feel good, would it?