Why do we feel worse at night when we have a cold or the flu?
Our immune system typically tends to follow circadian rhythm, which means it gives us a break during day time and tries to fight the virus during night time, which in turn causes inflammation and increased temperature in our body.
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 feel worse at night when we have a cold or the flu?
### Input: 
### Response: Our immune system typically tends to follow circadian rhythm, which means it gives us a break during day time and tries to fight the virus during night time, which in turn causes inflammation and increased temperature in our body.