I am trying to find a novel i read a long back. must be in young adult genre. It was about a realm which we can enter only through dreams. The world is composed entirely of things which we have dreamt of, past and present. its having kingdoms and the protagonist is a mage named Leonard Kite (not sure) and a woman who is in coma comes into this world.

the people in this dreamworld can enter the real world when they dream, though they are capable of remembering what happens in the real world. the first story indicates some kind of dark force that is forcing people in the real world to go into comas to use their dream power for evil.

Hopefully someone knows this. Any help is appreciated. I have tried regular google and it has not been helpful.

Thanks