Going to bed an hour or just a half hour earlier could have a profound effect on your health, happiness, and safety.

You could reduce your diabetes risk. Harvard researchers find that too little sleep reduces levels of leptin, the hormone that tells us to stop eating. More weight increases diabetes risk.

You would be less likely to develop heart disease. A 10-year study shows that women who got less than 7 hours of sleep at night had a higher risk of heart disease. Sleep deprivation raises blood pressure and increases stress.

You would be happier. The National Sleep Foundation says the sleep deprived are less satisfied with life and more likely to be angry. Dissatisfaction and anger were three times lower for those who got enough sleep.

You could keep yourself and others safer. Studies show that a drowsy driver is as dangerous as one who is drunk. A National Sleep Foundation survey shows that sleepy drivers cause more than 100,000 motor vehicle accidents a year resulting in 1,550 deaths and 71,000 injuries.