National Sleep Foundation

Chapter 8: Isolated Symptoms and Apparently Normal Variants


Every health professional occasionally encounters sleep-related behaviors that border the line between normal and abnormal sleep since it is difficult to determine what is typical or not for a specific individual.

This chapter describes some of these borderline conditions: long sleeping, short sleeping, snoring, sleep talking, and sleep starts. These are hard to fit into the other sleep classifications.1


  1. Thorpy MJ, “Classifications of Sleep Disorders,” In Kryger M, Roth T, Dement W (ed.), Principles and Practice of Sleep Medicine (5th Edition), St. Louis: Elsevier Saunders, page 687.