Tact is the sense most active during sleep

The senses are not completely turned off during sleep, but its capacity is reduced.
The senses work while you sleep?

They are not completely off, but its capacity is reduced, saysneurologist Cypel Saul, Albert Einstein Hospital in Sao Paulo. Thebodies responsible for touch, smell, hearing, sight and taste are connected to sensors that continuously sending messages to the brain. Even when sleep takes over, the information is still beingsent, but the brain areas responsible for interpreting the signalsbecome less responsive and have difficulty in makingassociations. The sleeper can even hear someone moving in the door, but it will not turn on the noise to the presence of a possibleassailant. The tact, however, remains alert. He works as a watchman's sleeping body.