Shift workers who work throughout the night have been known to have far more accidents as opposed to daytime workers.[42] This can be attributed to several factors, including fewer staff and fatigue; however, part of the problem may be the workers poor working memory and poor performance skills due to poor memory consolidation. Both implicitly learned tasks and explicitly learned tasks improve by roughly 20% after a full nights sleep.[15] Without an adequate nights sleep between learning a new task and performance of that task, performance fails to improve.[15] Shift workers who are not given an adequate amount of sleep, particularly in the NREM stage, between learning and performance of a task will not perform as well as workers who maintain a standard sleep routine.[42]