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@how mentioned this in passing on another thread the other day and I have been playing around with it recently.
I have always meditated eyes shut, but lately on occasions where I begin to doze, which is to say when I have dream thoughts starting up, I have been opening my eyes completely while continuing to focus on the breath. I find it helps. The key seems to be treating the view like I usually treat sound - no intentional focus (eyeglasses off helps) and no intentional naming. Of course the view needs to be essentially static, although slight movement of leaves in a gentle breeze has been ok.
I've tried opening my eyes a small amount as I have seen suggested, but more often than not they end up shut again.
I'd be interested to hear any suggestions and experience.