fatigue?

Anyone know if hay fever/this allergy thing causes fatigue?

I've been hyper-exhausted since Saturday and I dunno if it's been caffeine withdrawal or allergies or a possible actual sickness. I've been having bad allergies since Saturday. I've been lacking sleep nonetheless for the past months.. but I've been extra tired lately. I remember that this happened last year around allergy season too. I'm thinking that since my nose is plugged due to allergies that my sleep isn't necessarily smooth. BUT, I'm just wondering if anyone heard any other relations between allergies and fatigue (non-Benadryl influenced.)