Your light body.

Really. Our bodies communicate with biophotons. That makes sense to me as I'm energy sensitive and feel other peoples energy field. So I must be feeling their biophotons. This also explains attraction and repulsion to certain people. Start noticing who makes you feel good and who makes you feel like you need to be cautious

Your light body

https://wakeup-world.com/2013/07/12/biophotons-the-human-body-emits-communicates-with-and-is-made-from-light/

A different take on Depression. Depression downgrades your fear based thoughts to help you get through those fearful episodes. 

https://wakeup-world.com/2015/08/01/negative-thinking-the-cause-of-chronic-depression-anxiety/