Research suggests that ruminating (thinking about things deeply and repeatedly) about negative events is associated with poor quality of sleep, negative mood and depression.
According to a recent study at Duke University Medical Centre and NSF, poor sleepers are more likely to ruminate when compared with good sleepers. It was also found that poor sleepers’ ruminations were focused on symptoms such as feeling bad, fatigue and problems with concentration, all which are symptoms of insomnia. Based on the above finding the study suggests that ruminating about feelings and symptoms may lead to sleep disturbances.
Behay Sleep Med.2006; 4 (4); 228-41