How do i know when the dream sound will go off? Will it detect when i'm in REM and do it? Because im looking at the options and the options are:

-Alarm Mode
-Memory Mode
-Fresh Mode

The only one that relates to lucid dreaming is MemoryMode and it say's it will wake you up as soon as your last dream ends... Now.. maybe im missing something because im a newb again lol... but is this the part of the lucid dreaming??? so i wake up at the end of a dream and then go back into one? Or does it mean the end of a rem cycle in which i have to wait hours for another one then?

Thanks for help in advanced