Sleep is crucial to good health and a long life. Not getting enough sleep wreaks havoc on our sex drives, immune systems, ability to think and overall health. It can lead to obesity, heart and kidney disease, high blood pressure and diabetes. You're also at great risk for certain cancers if you don't get enough sleep.
Newborns to 3-month-olds should get eight to nine hours of sleep in the daytime and another eight hours at night (likely not in one stretch, as any new parent will tell you).