Why do people need sleep?
Sleep is necessary for your overall health and well-being.  Sleep is even so important not enough sleep can actually kill you.  Sleep enables the body engage in processes that help rejuvenate the body through better mental and physical performance.  A good night of rest will give you higher energy levels, better mood, clearer thinking and concentration.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------

----------------
Answer the following query.
Why do people need sleep?

user
Sleep is necessary for your overall health and well-being.  Sleep is even so important not enough sleep can actually kill you.  Sleep enables the body engage in processes that help rejuvenate the body through better mental and physical performance.  A good night of rest will give you higher energy levels, better mood, clearer thinking and concentration.
assistant