You could have other allergies along with grass such as dust mites but more importantly that moring at 2am if you had taken any pain killer or medication, it could be a side effect of that medication.
Alternatively, dust mite allergy
symptoms seem worst in morning as the reactions have continued through the night.
You will need skin testing or a blood test
(specific IgE) to aeroallergen panel to find out if you are developing other sensitivities.