Meditation blackouts?, experiences of a questionable nature Options

Lately, when in meditation, I have been experiencing something quite odd: when deep in meditation, I tend to have moments where I "blackout" or loose complete awareness of my environment. I am not thinking anything, but the experience is very 'bright' and positive; it isn't scary in the least. But when it does happen, it catches me by surprise, and that surprise jolts me out of the state. I have lost fair amounts of time in this state, but it feels like seconds. This has happened in zazen, Manjushri, and Kuan Yin meditation, for the sake of detail.

So, my real questions are, what could this state be? Do others experience it? If so, will you share some knowledge about it or thoughts on what it might be?

Any input is appreciated!

I can assure you that I am not high lol. I really haven't been meditating a great deal lately, but when I actually do this still happens. Maybe it is just the absence of thought, and my mind is unequipped to deal with the foreign concept of no-thought. Anyay, no matter what is ocurring, it really does soothe me so I can't complain.