Trigger controls in the bedroom or wherever you sleep need the most care. Air-conditioning can help. It allows windows and doors to stay closed. This keeps some pollen and mold spores outside. It also lowers indoor humidity.
Low humidity helps to control mold and dust mites.
Avoid too much air-conditioning or too much heat. Room air temperature should be comfortable for someone with allergies or asthma. Some people can't tolerate a big change in temperature, particularly from warm to cold air. There are some devices that effectively remove particles from air. Their usefulness in reducing allergy symptoms is under study.