The data also gives insights into who's likely to have those genes. Most people (56 percent) don't call themselves morning people, but those who had the morning DNA traits tended to be women, or else over 60. That fortunate group was also less likely to need more than 8 hours of sleep, or suffer from conditions like depression and insomnia.
23andMe is quick to acknowledge that this isn't the most comprehensive research. Ultimately, it was matching up the voluntary responses of 90,000 customers with their gene studies. While the team did toss out questionable responses, it can't vouch for the accuracy of everyone's responses. Also, it didn't account for the external factors that might influence answers, such as health, location or the time of year.
If the results hold up, though, they could lead to a big breakthrough in medicine. Doctors would know the most effective time of day to administer treatments, and could suggest more effective daily schedules. That could cause some social chaos (do you really want to get to bed hours before your friends?), but it beats being tired and bleary-eyed.