<s>[INST] Why is my asthma worse at night? [/INST] 
There are several factors that may contribute to you experiencing more asthma symptoms or more severe symptoms at night:

The circadian rhythm causes certain natural hormones (similar to those in certain asthma medications) to be at lower levels at night. These lower hormone levels reduce the diameter of the airways slightly and may make it more likely that you experience asthma symptoms at night.
You could be inhaling dust mite allergens from your pillows, blankets and mattress while you sleep.
When you lie down, the distribution of gravity on your chest can put extra pressure on your lungs. Source: Asthma Canada. Link: https://asthma.ca/get-help/understanding-asthma/frequently-asked-questions/. Field: Lung Disease. Disease: Asthma </s>