It is unclear when the expression Christmas tree bill was coined and by whom, but in 1956 Time Magazine published an article entitled The Christmas Tree Bill. The story was about a farm bill to which more than one hundred amendments were introduced.
In response to an infection, illness, or some other cause, the hypothalamus may reset the body to a higher temperature. Although the most common causes of fever are common infections such as colds and gastroenteritis, other causes include: Infections of the ear, lung, skin, throat, bladder, or kidney.
This happens usually when your body is trying to fight off an infection. Thus, chills assist in causing fever, but often arrive first before your body temperature actually goes up. The most common causes of chills in the setting of infection are Influenza, Pneumonia, Kidney infections etc. If you felt normal the next morning, then either your chills were not the cause of the infection, or your body may have fought it off.