It's recommended that we get an 8 hours of sleep a night. While we're sleeping, hormones help fix damaged tissue in the body, including skin. Without enough sleep, the body makes more stress hormones. This negatively affects not only the mood but also the skin, so a good night's sleep really is beauty sleep.
Although happiness is generally good for sleeping, when a person’s happiness varies a lot in reaction to daily ups and downs, sleep suffers, reports a Cornell study published online in the Annals of Behavioral Medicine.