Only very rare persons can know what kundalini is.It cannot be studied from internet.it It is spontaneous,natural.It is happening because of right aptitude,rightatmosphere,right action ,right yoga and offcourse of previous birth's karma.Doing yoga in the evening time is not suitable, because then the food is not digested completely
and because of body tirednesA.Yoga is not an exersise.It is a life style.