I don't get it. 1. Throw away the alarm clock; 2. Go to bed earlier; 3. Sleep as long as you really need to; 4. Things will be better. Sounds great.

I don't get it. 1. Throw away the alarm clock; 2. Go to bed earlier; 3. Sleep as long as you really need to; 4. Things will be better. Sounds great. So, I've gone to bed early, I've given myself plenty of time to sleep, I need to get up at some specific time. How do I know I'll wake up in time? It says: You might find, at first, that when you go to sleep earlier, you're still tired at the time you're supposed to be getting up. Yes. I might. This still doesn't answer the question: How do I actually ensure that I'm awake at the time I'm supposed to be awake? I don't get it.