Hi,
Since you are a known case of
hay fever the
sneezing in the morning is surely an allergic phenomenon.
Anything under the sun including the sun can cause
allergy and thus it is impossible to test everything for allergy.
More problems in the bed in the morning indicate the allergens are there in the bedroom only; can be in the bed, the clothing and coverings, molds on wall, dust in room dead mites in the carpets and so on.
I would advise you the following in such a situation:
Debug your bedroom by vacuum suctioning of the whole bed, carpet, curtains.
Go for pure cottons.
Take antihistamine and
steroid nasal spray at bedtime to avoid or at least reduce the morning symptoms.
Additional treatment as would be suggested by your ENT Surgeon.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General and ENT Surgeon