@ gab, I also think that delta waves can occur during meditation. With regards to that it probably doesn't matter if you are asleep or awake because if you are into deep delta meditation, you are kind of asleep anyways. If you manage to keep yourself awake while completely shutting off the internal dialogue when meditating you get all kinds of indescribable experiences, like sageous would put it.
But if you were to ask me, how can you be sure it's delta waves during meditation, for me, it feels like a very deep relaxation where you don't seem to care what you are engaged with anymore, yet you remain totally alert. You feel as if you are totally merged with the room, which may become obscured by light patterns (if your eyes are open during the meditation), etc and it may even disappear. Whenever that has began to happen, I would usually be too startled to let the world shut down and see what's behind the room becoming pixels and disappearing while my eyes are wide open. I guess effects can go even deeper with even more delta waves...yogis know best...
Sorry to drift off topic here, decided it might relate a bit to delta sleep though.
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