It's called a polygraph, not a lie-detector test.

Scientifically they are highly inaccurate.

The test and the results can be affected by a number of factors.

I guess someone watched The Devil's Hour?

The phrase "witching hour" began at least as early as 1775, in the poem "Night, an Ode." by Rev. Matthew West, though its origins may go further back to 1535 when the Catholic Church prohibited activities during the 3:00 am and 4:00 am timeframe due to emerging fears about witchcraft in Europe.

During the time in which this term originated, many people had sleeping schedules that meant they were awake during the middle of the night. Nonetheless, there is psychological literature suggesting that apparitional experiences and sensed presences are most common between the hours of 2:00 am and 4:00 am, corresponding with a 3:00 am peak in the amount of melatonin in the body.