There are many possibilities. a. There could be dust particles and not pollen dust around you which are 1 micron size and you are sensitive to these dust particles. To help you better, send us, the weekly and monthly trend on dust particles , we can give you list of possible particles that might be affecting you.
There are multiple factors. To answer your question, yes, temperature could be a discomfort. What is preferred temperature for you personally, need not be comfortable for the child. The adipose in the child may not be able to tolerate the temperature.
Other than that, there are other factors too like C02 in the room during night could be another disturbing factor for the child. Kindly check all 4 parameters from My Air, check the AQ for the night. Change the AC settings and monitor the child. Use My Air device specifically for the child and monitor the values.
Certainly, dust particle seems to be the cause. We will send you the values of dust, temperature and C02 for locations that are recording this humidity. Send us an email on firstname.lastname@example.org for a continuous analysis report.