A study showed that subjects were first allowed to participate in the learning to eliminate a certain bias and played the sounds associated with the learning to eliminate the bias  Then, subjects were allowed to enter a deep sleep state and played those associated sounds repeatedly, which had reactivated the learning to eliminate the bias  The results showed that the bias was greatly reduced than before sleep, and the higher the sleep quality, the more prejudice is reduced
It is difficult for ordinary people to get sleep intervention to eliminate prejudice learning.
 The researchers speculate that sleep intervention can reduce social prejudice and discrimination