That’s the conclusion of a study by Binghamton University which found that people with irregular sleep times are generally more negative.
The research, published in the journal of Cognitive Therapy and Research, asked 100 people to carry out tasks and fill in questionnaires that would look at how much they worried.
Their study found that happiness is not just affected by how much sleep you get, but what time you get to bed.
Jacob Nota, lead author of the study, said: ‘Making sure that sleep is obtained during the right time of day may be an inexpensive and easily disseminable intervention for individuals who are bothered by intrusive thoughts.’
In its abstract, the report found: ‘Individuals who endorsed a preference for later sleep and activity times also reported more [repetitive negative thinking]. These findings suggest that RNT may be uniquely related to both sleep duration and timing.