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.
1928
1981
2013
1936
2000
—
2024
2023
2010
1998
2019
1983
2021
2017
2020
2015
1935
1984
1959