Otherwise known as "Rowing Roulette" or "Where is the Next Wave Coming From". You hear the rushing sound of a breaking wave and brace for impact...but you can't see it coming. Much easier under a full moon. And part of the reason that I've adjusted my routine away from 2-hour shifts and to a day full of rowing and a larger chunk of "sleep" at night. "Sleep" is in quotes because it is really just an approximation of sleep.