<p>Vertex sharp wave transients, appear in Stage NREM2 sleep. These midline sharp waves run down the vertex and are typically theta in frequency and are of high amplitude. A surround may present at the left and right leads.&nbsp; Vertex sharp waves are usually biphasic. They can occur individually or in runs (repeatedly for a brief time). The morphology of V waves varies in sleeping individuals. In some cases, they are sharply contoured, in other cases they can look like epileptiform discharges.&nbsp;&nbsp;<br></p><p style="text-align: center;"><img src="@@PLUGINFILE@@/vertex-sharp-waves.png" alt="Vertex Sharp Waves" width="402" height="683" class="img-responsive atto_image_button_text-bottom"><br></p><p style="text-align: center;">Figure : Vertex Sharp Waves<br></p>