Thank you everyone for writing in this forum.
After reading the thread, I clearly have the symptoms of a periodic buzzing in the lower leg - 2 seconds soft vibration every 15 seconds. This started only 3days ago.

I am fortunate that my wife is a medical specialist - a family practitioner - who then specialised as a pediatrician (6 years experience) - who later specialised as a clinical geneticist (8 years exp.) - who finally specialised in pharmaceutical medicine (12 years exp.).

With her help I checked some cross references about l'Hermittes. Apparently, this condition can be caused entirely by inadequate support of the head and neck when sleeping and poor posture when sitting. I will be using additional and more supportive pillows to support my neck more from now on. Her comment to me was: "I recommend trying this for several days before any self diagnosis of MS!".