Who are the long sleepers? Towards an understanding of the mortality relationship

White much is known about the negative health implications of insufficient steep, relatively little is known about risks associated with excessive steep. However, epidemiological studies have repeatedly found a mortality risk associated with reported habitual tong steep. This paper will summarize and describe the numerous studies demonstrating increased mortality risk associated with Long steep. Although these studies establish a mortality link, they do not sufficiently explain why such a relationship might occur. Possible mechanisms for this relationship will be proposed and described, including (1) steep fragmentation, (2) fatigue, (3) immune function, (4) photoperiodic abnormalities, (5) tack of challenge, (6) depression, or (7) underlying disease process such as (a) steep apnea, (b) heart disease, or (c) failing health. Following this, we will take a step back and carefully consider all of the historical and current literature regarding tong steep, to determine whether the scientific evidence supports these proposed mechanisms and ascertain what future research directions may clarify or test these hypotheses regarding the relationship between tong steep and mortality. (C) 2007 Elsevier Ltd. All rights reserved.