Namaskar should also not be done to the following individuals:
One facing the South: Yama frequencies are mostly emitted from the Southern direction. An individual facing South generally comes in the range of such frequencies and also in the region of attraction boundary, and hence a whirlpool of these frequencies gets formed around him. By doing Namaskar to such an individual, the transmission of Yama frequencies starts circulating in the body of the embodied soul doing Namaskar. Due to the rapid circulation of these frequencies in the body, the flow of five vital energies is reduced and the flow of energies located in the lower region accelerates. This may cause distress to the embodied soul and that is why if possible, one should not do Namaskar to a person facing South direction.
A sleeping person: Since a sleeping person is parallel to the ground, the distressing frequencies emitting from the ground get attracted towards his body and it gets charged with distressing frequencies. The flow of five vital energies and the blood circulation is always at low pace while in the sleeping state. In such a state, sub-vital energies from the body start gaining speed and the wasteful gases start circulating and moving downwards. This leads to polluting the area around the body due to gaining momentum of the raja and tama emitted from his body. If one does Namaskar to such an individual whose body emits the raja-tama predominant frequencies, then it can cause distress to the individual doing Namaskar. That is why one should avoid doing Namaskar to a sleeping person.
(Ref: Sanatan’s Publication – ‘The Correct Methods of doing Namaskar’)