Sometimes my asthma is worse at night - it could be the bedroom you are sleeping in. I have a lot of allergies and one of them is dust mites. Make sure your bedroom is as dust free as you can make it, no rugs, not flower arrangements, if you have curtains, wash them frequently. Wash your sheets with hot water at least once per week. There is a new spray that is supposed to control dust mites, I haven't tried it yet so I don't know if it works.
If you have pets, make sure they are not allowed in your bedroom. I did get an air purifier for my bedroom and it works, the only down side is the filters are very expensive, a word of caution - don't put it close to your bed, it actually draws the dust and irritants to it and you are worse (at least it happened to me).
Don't know if any of this will be of any use to you, but keeping my bedroom really clean and dust free helps me alot.
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