Tibetans talks through all the different stages of heightened awareness as you meditate deeper. In fact, one of the meditative technique requires you to visualize the Tibetan alphabet letter for AH sound, sort of like the OM sound in Hindi, and it goes into great detail about what sort of sensations one might feel, so its very possible that you've reached a mental state that is just void of the ego that you used to have. It's the ego that fears death most of all, because it means losing attachment to the material things in the ego's mind.

I remember one Hindu guy telling me after a long discussion in the sauna, "Ego is your brain trying to protect you from truths you cannot handle".

It left a lasting impression on me.