A.s.a. Harrison said this quote

Though sometimes when he wakes in the night all he can think about is death. His own death, of course, but also the death of those around him,the fact that one day in the not-too-distant future every person he knows, every single one, will be dead and gone, along with all the people he doesn't know,to be replaced by a crop of strangers who will take over the structures left behind.