Why do we have winter and summer clocks?
Even today, this remains the rationale behind the clock change: aligning citizens' waking hours to daylight hours to save the energy spent on lighting. There are more daylight hours in the summer, and it is preferable to get up earlier so as not to waste precious daylight time while sleeping.
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 we have winter and summer clocks?

user
Even today, this remains the rationale behind the clock change: aligning citizens' waking hours to daylight hours to save the energy spent on lighting. There are more daylight hours in the summer, and it is preferable to get up earlier so as not to waste precious daylight time while sleeping.
assistant