He would give his family fifteen more minutes of sack time, he thought, before he would wake them up.

“We’ll have a little man-to-man talk while the leathernecks get some sack time.”

"I'm taking sack time while I can," he says.

Some brain-training programs could also prevent dementia. We all know there is nothing like a good night's sleep—sack time enhances mood, memory, immune function and hormonal balance—and yet the scientific underpinnings for sleep continue to be a mystery.

Here’s something new: a government report about which states get the most sack time.