Scientists already know that good sleep protects against obesity, heart problems, and cognitive impairment. But in order to get enough sleep and maintain health, it is important to notice the positive aspects of life. For example, optimists sleep longer and stronger.

Sociologists at the University of Illinois conducted a survey of 3,500 men and women aged 32 to 51, residents of four cities in the United States. After taking into account various socio-demographic characteristics, health status and symptoms of depression of recipients, they revealed a clear connection between optimism and quality of sleep, Science Daily writes.

The level of optimism of the study participants was measured in accordance with the answers to the questions in the questionnaire, in which they should indicate how much they agree with statements like “I am always optimistic about the future” or “success is unlikely to be expected”.

In parallel, respondents twice reported the quality and duration of their sleep, cases of insomnia, and difficulty falling asleep. Some of them took part in a three-day sleep study, during which their condition was recorded using equipment.

The results showed that optimistic participants had a 78% higher probability of high quality sleep than pessimists. They usually slept from six to nine hours a day, and 74% less often complained of insomnia or drowsiness during the day.

“Lack of healthy sleep is a public health problem, because poor sleep quality is associated with many diseases, including a high risk of obesity, hypertension and mortality from various causes,” wrote Professor Rosalba Hernandez.

While scientists are not ready to give a definitive answer, how exactly does optimism affect sleep. Presumably, a positive outlook allows you to better cope with stress and relax.

Not only lack of sleep, but also the habit of sleeping more than the recommended seven to eight hours can lead to health problems. Lovers of sleep 10 hours or more were 56% more likely to die from a stroke and 49% from other cardiovascular diseases.