It is a striking find, which proves that some 200,000 years ago people already used grasses for a comfortable sleeping place. Even though they probably did more than just sleep. "We know that people both worked and slept on the grass," says research leader Lyn Wadley. "We found debris from making stone tools mixed with grass residues. Many small, round grains of red and orange ochre have also been found. These may have been detached from human skin or from colored objects."