The night before all of this begins, you cannot have any sleep. The idea is to steadily increase your sleep pressure, so depriving yourself of sleep (and staying up in whatever way possible) is going to be key.
Here is How it Works
Let’s say that you get 4 and a half hours of sleep on your own and that you would like to wake up at 6 AM. On the first day, you would stay awake until 4 ½ hours before 6 AM (the first night) – this would be 1:30 AM.
At 6 AM you would wake up, potentially using multiple alarm clocks. Immediately after waking, let your body know that this is the morning (otherwise known as your ideal time).
You can easily do this by being outside in bright lights, moving in some way and being around people. This is easy enough, like going to your local coffee shop and ordering from the barista.
During that entire first day, you want to do whatever possible to avoid napping. The next evening, you add 15 minutes to your sleep time without changing your ideal time for waking up.
That would mean going to bed at 1:15 AM and then waking up at 6 AM. Again, wake up, be active and stay awake all day until bedtime.
Each night, go to bed 15 minutes earlier. Continue this process until you are completely satisfied with your sleep. The vast majority of those with longstanding insomnia can get healthy sleep again by following this process.
Wake therapy is so powerful, many also use it to come off from sleep aids. In this case, though, you will want support and assistance from your doctor before doing this.