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Im 22. It's been more than year now dealing with shortness of breath/over breathing. It started with panic attacks. blood test and ECG done which came back everything normal.
this shortness of breath comes maximum time at night before sleeping. After good sleep it usually goes away. It also hard to sleep with this.while it's going on It's really hard to fix it and get into a natural rhythm.
if i focus on breathing it get more worse. So i try not to focus on it. But it's really hard to do that. i just can't take this anymore 
I get this as well. Do you sleep supported by several pillows - in case you have reflux disease.
recently i got sinus infaction. Can it be the reason behind triggering shortness of breath?
Possibly. You may have slight chest infectionor get sob when lying down due to blocked sinuses . RU taking any antibiotics or pain killers?
No. Im not taking anything. Btw Its getting better slowly.
Bluesky
There are Breathing Techniques you can try, they are mentioned on site
Sometimes people when they go to bed can have something similar, especially if the room is colder ? that the room you have just been in. However in your case it sounds like anxiety because you have gone through the tranche of test giving clear results
Talk to your GP, if you are having problems with breathing you can try covering your mouth and nose with a paper bag, breath in the bag and breath out the bag if it is an Anxiety causing this it may help
Do not use a polythene bag, dangerous !!!!!!
BOB