What is the shape of the universe 

We dont know cos we havent seen the edges/^÷ boundaries where it ends 

If the universe ends at some point,has a boundary,  what lies beyond?

We cant know ,if we did, then the boundary would push further just beyond that

Then the boundary of the universe is also the boundary of our knowledge?

No, not the limit of our knowledge , but the limit of our comprehension... otherwise the boundary woild show up while we are in deep sleep, or at the back of our head.

Does space disappesr when we sleep ? No we sleep in space. If it were to disappear, we wouldnt wake. What if it did and we woke but are living a dream ?  A fragment of consciousness and memories without a matter component ?

Who would know the difference ? Can consciousness move a physical object ? Can it press a switch ?

It cannot, but it can imagine a switch, and imagine it pressed... 

But it would know that it is doing the pressing and percieving the pressing

What if it split itself just before the pressing, that it didnt know it did the pressing ?