| | One possibility (among many, as Dan K indicated) is simple mental tiredness associated with high levels of effort in the meditation. Also, sleepiness can arise from meditating with the eyes closed, especially when not much light is falling on the eyelids, in a comfortable position. Lying down comfortably on my bed in the dark and following certain instructions for jhana is a surefire way for me to get a nice nap in, because the posture, lack of light, and high concentration (with low effort) leads to sleepiness. So perhaps you could try doing standing or walking meditation, or being in a brighter place, and see how that makes you feel.
Of course, sometimes the sleepiness is simply GOING to happen. You can walk in broad daylight with eyes open and if you're in Dissolution, you might still be tired anyway. Acceptance is quite prudent, especially if Dissolution is actually where one is at. (Not that I'm suggesting that you're in Dissolution; I don't have the details on your situation to tell if this is related to insight stages.) |