Sleep disorder

Hello everyone,
Right before I fall asleep, a minor nasal passage obstruction triggers the "lack of air" anxiety (of not surfacing in time). Whenever it starts happening--if I were to rise from bed and start walking (and deliberately thinking of something else)...the psychological pressure slowly dissipates within a minute, two, or three...without re-occurrence when deliberately thinking of something else (immediately returning to bed to fall asleep).
I've been having this "sleep disorder" for the past 1 1/2 years...it happens about once or twice per month. When it happens it's very scary! Can anyone tell me the name of my "sleep disorder"? What can I do to get rid of this sleep disorder?
Thank you in advance!

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