Sudden Allergy Attack in the Afternoon - What Could Cause It?

I’m not exactly sure what this pertains to, but lately I’ve been having terrible allergies. However, it’s not a normal cold where I’m always feeling congested or sick consistently. I seem to wake up fine and go about most of my day with no problems at all, but always around 3-4 in the afternoon, I get hit with a terrible allergies where my nose just closes up, I can’t stop sneezing, my eyes itch and I can barely breathe. I usually take allergy medication and it’s resolved after a few hours. I don’t leave the house or do anything different that would cause a sudden trigger in allergies, and I’m in the same apartment I’ve been in for the duration of the day, so it’s not like a location change would trigger this. Does anybody else experience this or know what might cause the sudden, but not long lasting allergy attack?