Normal in terms of spirituality abnormal in terms of material world ! . material world and spiritual world never goes hands in hands both path are different . what ever right in material world and whatever considered as permanent in this world its totally wrong temporary and rubbish to outer world its a different thing and nobody cant understand or take further steps to proceed most of them will fall in between itself . i know im confusing and going off the track but in long run you understand these . ok coming to your point yes it happens not only minor feelings but also many things higher chemical reactions happens in body and mind . its because you are purifying your soul with spiritual sword so body needs to recycle and it rejuvenates itself . if you do patajanli astanga yoga your body will fly in the air !! . you get many weird terrified dreams visual of nature animals ancestors gods etc . as you move further you cut off your physical body totally become one with cosmos you no need food sleep or any material activities you attain samadhi state . but for now its just weird feelings and strange things dont panic keep on doing dont listen to mind its distracting you and trying to take wrong path , dont give place to that . krishna says mind should be tamed and bridled . so never give up , there is battle going on between material and spiritual its upto you to decide which path should take .. ...