It could be Eat but Idk A lot So Go with your gut
Researchers are most likely to use an electroencephalograph to measure their brain wave activity throughout the night. Formulating a hypothesis. Find out what goes on in people's brains during a typical night's sleep, Proposes that there is a relationship between the amount of sleep deprivation and the ability to solve complex mental tasks; the more sleep deprived people are, the more mistakes they are likely to make.
Physically speaking if one had High self-esteem and a positive outlook you would presume that the individual would be less stressed leading to:
Less chance of heart diseases
Weight loss
more energy
better memory
and the list continues
-hope i helped <span />