What happens when you don't sleep enough, skip breakfast, don't exercise, or hold grudges? Find out how these behaviors are harming your health.

What happens when I only sleep five hours?

The inside story: No one knows for sure why sleep is necessary, but there's no doubt that getting too little throws a wrench into your body's works.

For example, studies show that a sleep debt lowers levels of the hormone leptin, which helps keep your appetite under control. Implication: Sleep too little, and there's a good chance you'll be soon overeating. Sleep deprivation also boosts levels of stress hormones, which prompt your body to send more glucose into your bloodstream. Too little sleep also makes your body less sensitive to insulin.

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