It can be very controllable... or not.
Depends on how much you take.
And how skilled you are at driving your mind-vehicle.
There are a lot of parallels between the two experiences... and it is really good fun to smoalk DMT in a Lucid Dream!
"Curiouser and curiouser..." ~ Alice
"Do not believe in anything simply because you have heard it. Do not believe in anything simply because it is spoken and rumored by many. Do not believe in anything simply because it is found written in your religious books. Do not believe in anything merely on the authority of your teachers and elders. Do not believe in traditions because they have been handed down for many generations. But after observation and analysis, when you find that anything agrees with reason and is conducive to the good and benefit of one and all, then accept it and live up to it." ~ Buddha