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I had the same and it turned out to be asthma.

Note I had no symptoms during the day (even when jogging or weightlifting). In my case it's induced by dust mites and there is no good defense against this except asthma medication.

There are also people with sleeping problems due to silent reflux.

If you feel you're clearing your throat often, burp a lot or lacking air, check for those two.

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one can definitely do something about dust mites. I thought I had a cold, flu or something and could not breath comfortably because of the congestion; I tried cold medicine and allergy medicine and it did not help. I ended up searching internet at 2am and found out about dust mites. They and their poop will be in any sort of cloth material. Think matress, sheets, etc. enclose your matress in a 6 side dust mite proof matress cover. Supposedly matresses will accumulate 15 or 20 pounds of dust mites and their poop; think about how much that is. Also, your flaked off skin in food for them. You need to clean your sheets in 130 degree F water temperature to kill them. Same with all pieces of bedding; needs to be dust mite proof and properly cleaned to rid of them. Get a pillow cover that is dust mite proof. You can get dust mite proof comforter cover as well. Also, carpeting below bed could house them and their poop. I switched to hard flooring. Anyway, you can definitely do something about the dust mites. After doing this, problem went away and I slept much better.

I forgot to mention that I removed the carpeting myself and even though I used a very well rated HEPA vacuum; the crap that I found under and in the carpeting was disgusting. It was like there was a beach party or something. After see that I would remove any carpeting from a home that I owned and I would not rent a place that had carpeting.

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