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Sometimes when I dream something drastic changes. For example I dreamed a girl, but then the girl become another completely different person. Is this suppose to happen?
Is this on regular or lucid dreams? I'm assuming its a lucid, in which case this may happen for several reasons: you're not focused enough (which may cause the dream plot to shift), or it's simply the dreaming continue it's story even though you're lucid.

My RC is to get 2 clocks and see the time if the time is different(for example the first one is showing 1:20 the second is showing 2:20) I'm dreaming if they are showing equal time (+/- 2 mins) I'm in reality. Is there any problem with this method since I didn't see it in the forum?
Wow! That reality check has to be one of the best ones I've seen I honestly never thought of carrying two watches, I think I'm actually going to try that now ahahaha xD That reality check is great: if you're in the habit of checking time, having 2 watches will be really helpful, by all means keep doing it Just remember that reality checks can also represent "baby steps" towards an attitude of self-awareness: as you reality check more and more, start to try and maintain an awareness of your state for longer periods of time. You can start by looking at your watches, and after questioning about your state, maintain that alertness for a bit longer.