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.
1944
1924
2010
1995
1904
1951
2006
2014
1991
1907
2000
2024
2020
1956
1981
2017
1972
2007