Vertex waves

Synonymes: Vertex sharp transient or V wave

• Maximum at the vertex (like K complex)
• Amplitude: 50-150 microV
• Presence in non-REM 1 and to a lesser extent in non-REM 2
• Narrower and more focal than K complex
• Unlike K complex vertex waves are not associated with sleep spindles
• In children and young adult vertex waves could be sharp and in a repetitive run, not to be confused with an epileptic discharge.

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Non REM 1 sleep with slow rolling eye movements and vertex wave in a young adult (source)

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