Scientists from southwest University of China conducted a study involving 120 women. Volunteers were locked in a windowless room at a certain time with on or off the light, writes The Daily Mail.
In the experiment, the women showed 100 scariest and 50 neutral pictures were allowed to hear the frightening sound. This was estimated indicators of fear: sweating and heart rate. At the end of the experiment, the volunteers shared their experiences with scientists.
It turned out at night, the women experienced more fear than during the day. The presence or absence of light did not play a big role. Night, according to scientists, instinctively perceived by the person as a dangerous time of the day, increased vigilance, weleetka reaction to a potential threat.