Humans Need Less Sleep Than Any Other Primate Summary

The article “Why humans need less sleep than any other primate” published on the Earth section of the BBC website explains how the human brain has developed to need a little amount of sleep compared to the one of other primates (monkeys and apes). We sleep less, but we have more quality sleep and this may be the cause of our success as a species. In this essay, I will focus on some aspects of the language used by the writer.
Both elements of formal and informal writing converge in the text. Firstly, the author prefers to use full forms rather than contractions, but sometimes she also uses the latter, as in “what’s more” and “isn’t that why we are all so sleep-deprived?”. Full forms are typical of formal language.
Secondly, sentences are usually