Cockatiels are probably the most commonly known for having the worst cases of night frights among parrots. Usually, night frights occur for mainly the smaller birds but I have heard of a few cases of it happening for larger birds as well; including my own. I've had one bird fall off a perch during the night or begin having their own night terror...
My favorite type of training is behavior shaping. It can also be the hardest because it requires finding a natural behavior your bird already does and having a clicker on hand to let the bird know it's a good thing to continue to do for a reward. I trained my galah, Bondi, (featured in the video above with Dave Womach) to do what is called "Th...