At night when all cats are astir, human beings produce melatonin while they sleep, a hormone created by the body as a result of serotonin breakdown. Light inhibits its production in the pineal gland, which only becomes active in the dark. Hence, melatonin also controls the 24-hour day-night cycle. The hormone can be administered as medication and is often used for shift work or to fight the symptoms of jet lag.

The entrance area of Universalmuseum Joanneum is turned into a place of tiredness and sleep and activated into a sleepy music box.

A slowed-down escalator, a chiming lullaby, handing out melatonin to the visitors form a mutual action fabric for sleep.