The research received the Nobel Prize in psychology Never try to sleep with the joy in life with. By a group of volunteers who are women, the number of working age people, 909 details and mood for each day of the event; We found her to be happy each day, very little. Both higher income, each with 60,000 USD. This was mainly due to problems and insomnia at night which resulted in mood swings because they have problems with the job while the other one research experiment measured the level of happiness in a group of volunteer women who sleep soundly every night. Discover that they enjoy life more than the first group of volunteers in. Part because it does not have any concerns in mind that causes insomnia.
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