Which part of the brain keeps working even when we are sleeping? Explain.

Explanation

**Step-by-Step Solution:**

1. **Identify the Brain's Functionality During Sleep:**
- When we sleep, certain parts of our brain remain active to regulate essential bodily functions.

2. **Focus on the Medulla Oblongata:**
- The medulla oblongata is a crucial part of the hindbrain that continues to function during sleep.

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