In ways that provide the worst support for your cognitive functioning and emotional well-being. During the emerging adulthood, the cognitive development of the person is reached, which implies the development of the identity and a greater social development, this leads to many changes linked to the environmental events that the person faces (for example greater responsibilities). Several investigations have determined that during the emerging adulthood people tend to sleep less and have more problems of insomnia, this affects their capacity for reasoning and decision making.
I hope my answer can help you.