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.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Why do we have winter and summer clocks?
### Input: 
### Response: 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.