Nyctitropic is the movement, of plants, at night. Yep, daisies and cabbages are going to crawl out their beds and murder you in yours!
Nah, not really. This phenomenon is caused by changes in light or temperature. Usually it's no more alarming than leaves drooping or flowers opening at different times. For example mirabilis jalapa and nicotiana sylvestris flowers tend to be droopy in the daytime, but perk up in the evening and overnight. That's handy if you're pollinated by moths.