A recent study discovered that people who are the most optimistic tend to be better sleepers. The study was published in the journal of Behavioral Medicine. One of the researchers of the study Rosalba Hernandez said: The study revealed significant associations between optimism and various characteristics of self-reported sleep after adjusting for a wide array of variables including socio-demographic characteristics health conditions and depressive symptoms. Participants' levels of optimism were measured using a 10-item survey which asked them to rate on a five-point scale how much they agreed with positive statements such as I'm always optimistic about my future and