Oh wait that was the neti pot...in any event, your Christmas tree might be making you miserable. Maybe that's what makes people crazy at all those family gatherings.
"The team analysed clippings from 28 Christmas trees including needles and bark, from a range of species, and found 53 cases of mould. Of these, 70 per cent can cause symptoms including itchy noses, watery eyes, coughing, shortness of breath, chest pains, sinus congestion, feelings of fatigue and problems sleeping. Some of the mould identified can even lead to long term lung problems and conditions such as bronchitis and pneumonia."
Full article from The Telegraph