Lucid dreaming is an altered state of consciousness in which a person is aware that he is dreaming, and can control its content to some extent. This is a kind of borderline state between REM sleep and wakefulness.
1992
2006
2014
2016
2023
2017
1964
1947
1970
2013
2010
2020
2021
1974
1963
1928
1989