I had lucid dreams many times in my life..it often happens spontaneously.
This are some examles of my expiriences:
1.I suddenly realize that i am dreaming..I started to fly and its great..but the environment is strange..some things got erased..i don't have control of my dream
2.Sometimes i can't fly its a bit more realistic....
and ussualy the they are short

BUT this dream was crazy...
I am suddenly on some island i know that i am dreaming i looking around myself everything is normal...nothing erases..everything stays perfectly SAME...then i saw some island across the sea..well i tought i could fly but i couldn't...i was jumping and trying to fly like an crazy man in real world...and i jumped and just relaxed and i was in the air and i start to go forward...and there was nothing... i was imagining something... hoping that i could teleport there... like in my lucid dream experiences but i failed.... i was so nervous i was thinking... how can i get out of there i was walking trying to find something but once again...everything was same nothing changed it was like "real" but anyway i knew it was just a dream and that i am actualy sleeping..and kept trying imagining..and it payed off..

... I was at my house..i saw my brother and i desperately sad..hey you know what this is just a dream when you wake up tell me that you dreamed this dream please don't forger but that was actually not my brother xD cuz i cheked it out when i woke up.. in a dream..he said like..are you crazy this is not a dream..i couldn't belive..i said you got to belive me...he just made fool of me..i wanted to demonstrate flying..but i failed xD...and i got out the house but the sky was strange some spiral shape light was in sky i got scared because it's was so real...I got out of my house and talked with some guy that that is just a dream and after a while he came and said..i belive you the paper just got erased i was wrighting something and i suddenly the paper erased..that will not happen in real world..when he said that he blew my mind...i said are you dreamer..he said probably yes...i tell him how to fly..(that was just a dream I am not idiot but it was fun)..and he learned it..and we started to fly....

Then I got to third location where i could fell a wind blowing it was village actually and i saw some girl entering the house..i knew it was a dream so i decided to enter her back yard..i found a door and i rang the doorbell ..she actually opened the door..omg.. i entered the house was realistic..then we talked normaly..i mean it's not like in dream the people talk usually without sence..when i finished i exited the house...and started to think when i will wake up...when?...it became boring..i was regreting beacuse i didnt set alarm on my phone...i set on some bench i was just waithing and after i while i woked up..It was great expirience i didnt know that LD can be this realistic..

And sorry for really bad english...