Night owls – people who go to sleep late – tend to have wider social networks than morning persons, according to a study which showed that our inherent periods of sleep is linked to how we interact with others. The study also showed that night owls are more central in their own networks. They stick to their kind and interact with others who stay up late.”The digital breadcrumbs our daily phone use leaves behind can be used to monitor our behaviour. They provide a picture of our activities, movements, and communication Aledavood used anonymous mobile phone data to investigate people’s patterns of behaviour. Times of sleep can be inferred from periods of no smartphone use. The timing of calls made to friends and the size of our social networks, based on calls, texts, or emails, reveal our social habits.It is a lot harder to get accurate information like this from surveys, and it is possible to widen the scope of the study up to entire countries The findings may help understand and treat mental health issues.