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Early risers are people who [natural / naturally] wake up early in the morning. Their body clock causes them to get up while most of us are still in [depth / deep] sleep. Researchers at the University of California said early risers could have some [shared / shaved] DNA from Neanderthals – our [ancestors / ancestral] who lived over 40,000 years ago. Neanderthals lived in northern parts [off / of] Europe and Asia. They woke up earlier to [hunt / hunting] for or gather food as the sun [arose / rose] . Researcher Dr Tony Capra said: "At higher latitudes it is beneficial [to / for] have a body clock that is better able to anticipate and [change / charge] to match the changing seasonal light levels." He added: "Having a 'faster' body clock…makes individuals more [lively / likely] to rise early."

Scientists have spent a [long / length] time looking at why some people are early birds, while [another / others] are night owls. They looked at a medical database with [genetic / genetically] information for hundreds of thousands of people. They [compared / comparison] the DNA of people who said they were early risers with the Neanderthal DNA. Their research found more [example / examples] of Neanderthal DNA existed in the early risers. However, it is likely that the Neanderthal gene is not so [strengthen / strong] in many people. The [effect / affect] of the Neanderthal DNA may be weakening as the centuries [past / pass] . Our modern lifestyles mean many of us prefer sleeping [on / in] to leaving the comfort of our bed. Nevertheless, it may still be [true / truly] that the early bird catches the worm.