You are using an older browser version. Please use a supported version for the best MSN experience. I Spent Two Weeks Trying to Perfect My Sleep Routine, and I Highly Recommend You Do the Same By letters@purewow.com (Sarah Stiefvater) of PureWow | Element 1 1. You’ll Probably Feel Happier According to the Sleep Foundation, sufficient sleep, especially REM sleep, facilitates the brain’s processing of emotional information. “During sleep, the brain works to evaluate and remember thoughts and memories, and it appears that a lack of sleep is especially harmful to the consolidation of positive emotional content. This can influence mood and emotional reactivity and is tied to mental health disorders and their severity, including the risk of suicidal ideas or behaviors.”