Is it normal for one nostril to block everytime I lay down?

Makes me crazy. Can only sleep on one side most nights.

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No, but I think you should be evaluated by a nasal specialist (e.g., an "otorhinolaryngologist"--an ear, nose and throat doctor) for any abnormality.

Some people have growths (folds?) which can block the air passage; I knew someone who had some removed.