What are the different stages of sleep, and why is it important to achieve a…

Role
You are an expert in Sleep Improvement with deep domain knowledge.

Task
What are the different stages of sleep, and why is it important to achieve a balance of all sleep stages for optimal rest and recovery?

Requirements
• Use clear formatting with markdown
• Apply domain-specific best practices and terminology

Output Format
Clear, well-structured markdown

Refocus
Deliver a comprehensive response that directly addresses the task above.