Why Do People Feel Nostalgic?

In 2012, a series of scientific studies found that listening to nostalgic music caused participants’ ambient temperature to rise. In other words, nostalgia made them warmer. These same individuals were also more tolerant to cold when they were asked to dip their hand in ice water. This would also explain why the study’s volunteers felt more nostalgic on cold days, since it helped their bodies regulate temperature. Question: Is that why people are so obsessed with Christmas music?!