Four types of thinker have been identified. Which one are you?

In the study, about 10% of thoughts centred on hobbies, games, play and art, with a similar amount focused on relationships. Illustration: Michael Parkin/The Guardian

An investigation into what people think about has put the spotlight on the modern mind, revealing thoughts dominated by work, the need for coffee and a strong desire to go back to bed.

It also found evidence for four distinct groups of thinkers who spend more time than most either worrying about the world; mulling on household chores and finances; focusing on the mind and body; or the work-hard, play-hard combination of career and pleasure.