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Unformatted text preview: looks very wide). Then there is a sudden decrease in amplitude (so the wave now goes well below baseline) and then back to baseline. In addition, there is often a little spike in the wave when it is moving from high above baseline to far below baseline that gives it its characteristic "K" shape. If you are monitoring a persons sleeping EEG, sleep spindles are a nice indicator of Stage 2, but when you see K-Complexes, you know the person is definitely in Stage 2. d) Stage 3 - This is the first stage of what is considered "deep sleep" or Slow Wave Sleep (SWS). We spend approximately 7% of our time asleep in this stage, and it is characterized by approximately 20-50% delta waves within minimal amplitude. Although it is a type of deep sleep, many consider this a transition stage (much like Stage 1) between stages 2 & 4. As a result, there has been a push in recent years to eliminate Stages 3 & 4 and replace them with just a single, "Stage 3" sleep....
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- Fall '09