you surly have allergy it can be related to dust or pollen, but its mostly dust allergy
because its present through out the year. how much ever you try you will not be able to control dust mites which is present every where,you are lucky your symptoms are only during when you wake up for 5 - 10 min.many people have through the day full year. if your symptoms are not bothering you that much then you can ignore it if it bothers you and you need medication then it should be done in step wise manner
first if your symptoms is for few months a year like 2-3 months then you start an antihistamine which you have to take daily at night. if your symptoms still persist then your start using steroid nasal spray
, it has no side effect and it controls the allergy very well and you should start 2 weeks before your symptoms start. if this also does not cure you.
then get yourself tested for allergy, it is called skin prick test you will know what you are allergic to, then if possible you can avoid the allergen or you can start treatment called immunotherpy. this is currently the best treatment available and your symptoms will easily reduce by 80-90 percent kindly visit your ent specialist
he will guide you further.