California resident Bill Dubey recently hit the century mark. He says an active lifestyle, which incorporates an early start to the day, has been critical to his longevity.

Enter the time you’d like to wake up in our tool below and, based on 90-minute sleep cycles, we can tell you the best times to go to bed to wake up feeling fresh.

"These are all things we chose specifically, because in the evening you're trying to decide what time should I wake up in the morning, or in the morning you're trying to decide what should I wear ...

Should we be eating ... is the best time to eat breakfast? Nutrition experts generally agree that you shouldn’t be scarfing down food as soon as you wake up—wait a couple of hours, at least ...