If you enjoy getting up in the mornings, chances are you have one of 15 loci identified in a new genome-wide association study (GWAS). The investigators performed a GWAS on samples from 89,283 individuals who reported that they preferred to wake early in the day, referred to as 'morningness'. Women were more likely to be a morning person than men (48.4% versus 39.7%) and morningness increased with age; from 24.2% of people aged <30 years to 63.1% of people aged >60 years. Of the 15 loci identified, seven were located close to genes known to be involved in circadian rhythms. The investigators found that morningness was also associated with insomnia, increased BMI and depression, but in Mendelian randomization analyses, no causal relationship was identified.