Obesity treatment could be needed by people who find they have put on weight through late night snacking.
According to recent research from Northwestern Medicine, late nights and sleeping in in the mornings can increase the risk of weight gain.
This is due to the fact that people who go to bed late eat more calories in the evening, more fast food and fewer fruit and vegetables.
An extra average consumption of 248 calories was identified with this group.
They were also shown to eat twice as much fast food than those with earlier sleep times.
Kelly Glazer Baron, a health psychologist and neurology instructor, commented: "The extra daily calories can mean a significant amount of weight gain – two pounds per month – if they are not balanced by more physical activity."
A total of 51 people (23 late sleepers and 28 normal sleepers) with an average age of 30 were monitored for the project.