A lot of things have changed in the world—including parenting. Studies show that children who are taught basic etiquette tend to fare better in live and end up happier. Yet, the more time goes on, the more it seems like no one is teaching their kids good manners anymore.

Discover 8 reasons you may feel tired all the time. From stress and illness, to sleeping too much and not drinking enough water, find out the most common reasons people feel tired often, and what you can do about it.