what happens when insomnia strikes the brain?

what happens when insomnia strikes the brain? I think and ponder and wonder and plan and make and clean all in my mind i list out what I need to do and also see where my mind will take me, this last time my mind went to humans and how we as a people are always seeking a group or a social setting for other to except and support us and I also find it humorous that we claim to be so advanced yet we are all basically looking for our own tribe that we fit into and belong with.. just my thought's.