The period of time between when your alarm clock initially wakes you up (you turn it off instead of hitting 'snooze'), and when you actually get out of bed. After it's off and you're still lying there 'resting your eyes for a couple more minutes' you risk the chance of falling back asleep without an alarm clock to wake you up this time.

When you eat dirt for the first time and leave your family to build a shack in the woods