3 Waves of The Trend

Maybe this is obvious or not correct - I am still a newbie so please bear with me!

I have been analyzing historical M30 charts on GBPUSD and I have noticed that nice trends tend to come in a triple waves (sometimes it is 4 distinguishable movements).
While reading them I glanced on a freshly printed chart with a session timing for Sydney, Tokyo, Europe and New York.
The similarity of the shapes of timetable and trends was clear.

( the chart is there: http://www.forextechniques.com/tradingtimes.html )

It is actually one of the things Dr. Sivaraman (http://www.ibtimes.com/forex/) is teaching: market dynamics is closely related to the sessions timing (overlapping, gaps etc.), so if one wants to catch the wave sharply, one has to be awake at the right time!