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.
1926
1996
2018
2023
2019
1982
1932
2009
1964
2003
2022
1904
1969
2012
2020
2021
2024
1980