One mistake we make, probably because we never really think about it, is not knowing who we are or where we go when we are asleep. One third of every day, one third of our lives, is passed in an environment of which we are blissfully unaware, literally - blissful and unaware. So to begin with, a few thoughts on sleep. What happens at the moment of transition from being awake to being asleep? Can you be conscious of that moment? When you dream do you ever know then that you're dreaming? Can you have some say in what happens in dream? What happens when you are asleep and not dreaming? Who are we in sleep in relation to who we are when awake? We appreciate sleep, need it, look forward to it - why is that? What happens as a result of sleep? What does it do? Pick any question.
Start with establishing a principle: the result of meditation practice is not expansion of consciousness – consciousness is already complete - meditation is the expansion of awareness into consciousness. At first awareness appears to be who we take ourselves to be. But later awareness becomes the medium to realise who we really are.