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.
1983
1909
1907
1901
2022
2017
1974
1992
2014
1938
2010
2003
1921
2021
2005
1944
1984
2011
—