Lucid dreaming is when someone in a dream realises they are having a dream and can do anything they want in that dream if the believe so and can even experience the 4 senses other then seeing extremely vividly if they have the 5 senses in real life they just need to have the will power. ps: I am a master lucid dreamer and you should try lucid dreaming it is mesmerising.
Example 1. Random edgelord: *Is having a nightmare* Demon:About to kill the dude in his dreams. Random dude: *Does reality check and realises he is lucid dreaming* Demon: Bro why- *gets slapped into oblivion* Edgelord: *revives demon and kills him again*