Читать книгу Dental Management of Sleep Disorders - Ronald Attanasio - Страница 30

This is a deeper stage of sleep but is also considered to be light sleep where the individual maintains a variable level of EEG activity. In this stage, an individual may be aroused easily or awakened. This stage comprises about 50% of the total sleep time and is considered as the first true stage of sleep [5]. The unique and significant EEG features of this stage of sleep are the presence of the K complex and sleep spindles. Sleep spindles are known to act as a filter that blocks out any noxious stimuli, such as noise, light, and even pain that might act to disrupt sleep. Of particular interest to the dentist is that sleep bruxism occurs primarily during this stage of sleep. The K complex may appear as a result of some type of stimulation such as noise or may appear spontaneously. They may also be seen when respiration is interrupted especially during inspiration. The main function is to suppress cortical arousal when there is stimulation and to aid in memory consolidation.