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.
1982
2021
2019
2016
2013
1928
—
1991
2017
2020
1981
2022
1903
1950
1999
2001
1921