Here are some science
Changes in air pressure can affect the retina and under certain (not rare) circumstances can make you think someone is in the room when they are not. This is especially common in old, drafty buildings or buildings where air flow is artificial (fans, air con etc)

Walking through a park in autumn when the sun is low in the sky (filtering through the bare trees) can cause the same strobe effect that induces fits. Many people attest to seeing big devil dogs etc but these are just the brain going off on one due to the strobing.

or it could be invisible energy lines like you say...
( BadBadman saw an incorrect comma placement on, Fri 4 Jul 2008, 11:41, Reply)