On the flip side of that, the first time we were dead, when and how did we become conscious? Obviously the biological processes have a fairly well-defined start point (i.e. conception), but obviously consciousness does not start at conception as there is no brain yet. So when does it start?

I have wrestled with this after my first kid was born - there was nothing and now there is this person with their own mind and wants. Perhaps it was just the lack of sleep that got me thinking. But - When did their consciousness start? What was that first moment of awareness? Was there that initial "spark" and something started happening? Or was it a slow, slow clearing of fog before some sort of concerted thought began? What was that first thought? is a baby in the womb aware of self? Maybe not - but if not, when does that begin? When is that first moment when a baby looks in a mirror and sees themselves? What goes through their mind that first time they realise the thing in the mirror is them?