Transient amnesias in particular may last a few hours, almost always less than a day. Any number of things can trigger an episode, or nothing at all. Sometimes a heightened emotional experience, even sex, can set one off. In the Boston area, I tell the residents, there’s a big spike in these cases in early summer when people start swimming in the ocean. Cold water may be the opposite of sex, but it can create a shocking experience nonetheless, and can trigger TGA.
