Awakening to/as the Witness, as space & awareness, one aspect of the exploration process has to do with what happens when the small self goes down, through illness, tiredness and sleep.
Do we, as space & awareness go down with it (into unconsiousness), or can we learn to differentiate and stay as space & awareness even though the small self goes down.
In the beginning, we can learn to stay as space & awareness when the small self is tired and ill in various ways. Then, we can stay as a stream of space & awareness through the sleep of the small self. And eventually, it we are relatively familiar with and stable in this process, we can (it seems) stay as space & awareness through the death of the small self.
(This topic came up as it seems to be a fertile ground of exploration for my partner right now.)