Hello.
1. Yeah, the sleep-wake cycle should be pushed backwards, rather than forwards. Due to the delayed release of melatonin, the adolescent would feel more sleepier later, and thus sleep later, and wake up later. This means that the sleep-wake cycle is delayed as their falling asleep and waking up times are shifted later. Basically, with bright light therapy, you would want to expose the individual to light (from the light box) earlier in the day, such as in the early morning, so that they are more likely to feel sleepier earlier. This is because they have been awake for longer (I'm not 100% sure on this point), and so their sleep-wake cycle would be shifted forward (or advanced), making them sleep earlier.
2. They are susceptible to suggestions but as a result of them being more likely to follow the suggestions, they are more likely to stop bad habits . For instance, if someone has a bad smoking habit, since hypnosis makes them more likely to follow suggestions, they are more likely to follow the suggestion to quit smoking (or any other bad habit for that matter).
3. When we travel in a westerly direction, we are following the pathway of the sun. The sun rises in the east and sets in the west, and so when we travel in a westerly direction, we are following the pathway of the sun, meaning that when we land in the destination, it is easier for us to adapt our sleep-wake cycle to the day-night cycle of the time zone.
4. Yeah, I was confused about this as well. Basically, if there is a longer period off between the different shifts, the individual has more time to adapt their sleep-wake cycle to the required work shift schedule. That is, it would be much better to have more time off between shifts, rather than quickly shifting from an afternoon shift to an evening one where there is no time for the individual to adapt their sleep-wake cycle to the desired shift. Hopefully this helps.
Hope this helps!