Upon entering into the dark photoperiod in the absence of food, torpor causes a precipitous drop in both body temperature (25C) and metabolic rate. Raw data from two mice as preliminary studies leading to Hrvatin et al. Nature 2020. C57Bl/6J female mice. Blue: a mouse with free access to food. Red: a fasted mouse. Performed in the CLAMS. Plotted in R & ggplot2.