Long before mercury thermometers, ancient physicians linked fever to the four humors, noting that night sweats and rising heat often signaled an imbalance. Scrolls from Hippocratic schools describe night‑time checks as a way to gauge the body’s struggle against excess blood or bile, laying a philosophical foundation that persisted for millennia.

The 19th century introduced reliable glass thermometers, allowing doctors to quantify what had been described in metaphor. By the early 1900s, hospitals instituted standardized nightly checks, turning fever into a data point that could be compared across patients, regions, and eras. The digital revolution of the 21st century now streams temperature readings to smartphones, making “Fever Results Tonight” an instant, global conversation.