Getting truth chills very often...why?

I have been practicing meditation and yoga for a long time. I have been through some transformation of sorts. Lately, when I listen to music that is beautiful, or when I pray, or when I have a good conversation with someone, I get these chills that run all over my body. They are not out of fear, but they do sometimes overtake me. Can someone explain what is going on? It happens quite a lot.