Never Let Me Go

I went to donate blood to the local hospital this morning. While I was lying on the stretcher I suddenly remembered this book, Never Let Me Go by Kazuo Ishiguro.
I think it is a very good book. It makes you ask yourself what makes us humans.
I liked it a lot and I also enjoyed the film very much. Keira Knightley, Carey Mulligan and Andrew Garfield played their roles wonderfully.

Why did it come to my mind while I was there waiting for my blood donation to end?