Laboratory studies on the effects of temperature variations on drowsiness.

20 subjects were analysed in a laboratory study investigating the inhibition of drowsiness by altering air temperature. The EEGs of the subjects were used to measure the effect of sequences of temperature lowerings of 10 degrees for 2- and 4-min. periods. The effect upon wakefulness was analysed through EEG recordings and subjective ratings. Results indicated that reductions of the air temperature of 10 degrees during repeated 2- and 4-min. periods significantly increased wakefulness.