what is the use of meditation for astral travelling and lucid dreaming ?
I will hold myself short on this one because there are many factors which have a benefit to those 2 subjects.
So the first and in my opinion the best benefit is the energy conserve which your mind gets to keep from the meditation. We think and overthink things way to often and when you meditate, those thoughts will get less and lesser and the energy you used for that can be used to achieve faster results in astral travel and lucid dreaming. Furthermore, you will have lesser headaches and stay calm on stressful situations.
The second thing which can be seen and felt is that your mind becomes more opened to other things and doesnt stay cramped in the circle of thoughts.
And the last thing is, that when you do meditations often enough, it can work as a method to directly induce astral travel and lucid dreaming in sitting positions. This would be the crown of the meditation because thats whats actually really for! Meditation itself was invented to calm ones mind but it happened that there was way more than just that.
Anyway, if you want to know more, just look here: