question: I need your opinions, my eyes feel tired all the time despite me constantly applying natural tears, I m always very very tired or somewhat sleepy.. I m not able to concentrate on work i feel like my mind will be blank sometime..My question is that can allergy cause drowsiness? And are my above symtoms the result of an allergy? I have depression but somehow, no matter how i sleep i m always so tired. I don t know what s wrong with me ans so far no one has been able to help me.