Two kinds of LD

[Creo]

 Hello everyone.

I began mastering lucid dreams about six months ago and I had a plenty of LD during this time (Not regularly, not often, but not too rarely). I wouldn't say that the dreams are so bright and distinct, I found that it's difficult to observe one item because it's always changing, for example trees change their form, number of branches and they even may become other trees but this doesn't matter now.
I discovered that lucid dreams in which I get into realizing during a normal dream that I'm dreaming greatly differ from those in which I may enter while trying to imagine a definite place when I'm in the bed (I can do this after a long sleep).  The first type of dream doesn't differ from the normal LD (I'm not sure that I may say 'normal lucid dream') which is described in books about LD, however they are usually short because I'm forgeting that I'm dreaming.

Second kind of LD is very easy to reach but... I have total control over such a dream, I can't fall asleep because it requires concentration, I have to continually imagine where I am, otherwise I don't see any picture (just dark screen), I can move in this dream (but sometimes and also first steps are very difficult to do), when I'm concentrating on motion or some thoughts I'm also loosing a picture however I can go on moving and don't loose orientation in the space (!). When I'm trying to do something unusual in such dream I'm waking...
In addition, I am feeling strange things when falling in such dream and when awaking from it, I really can't describe this... something like feeling when making an astral projection (I newer did AP, just some authors describe their feelings and it sounds very similar). Also my dream body is much heavily then my physical one.

Probably someone experienced something like this or knows something useful? Actually I just want to know are these dreams the same or they really differ. Of course I will go on make different experiments on both kinds of LDs.
Also... excuse me for any mistakes, English isn't my native language.