And if you look at sleep and dreams biologically, animals sleep and dream, and they rehearse and they do some other things that help memory and that are a very important part of sleep and dreams.
I ako na spavanje i snove  gledate s biološke strane, životinje spavaju i sanjaju, time ponavljaju i rade stvari  koje potiču pamćenje, a to su vrlo važni elementi  spavanja i snova.