does this happen to anybody else? after long sessions - esp. dp sessions - when i close my eyes later i see waves, walls of approaching water just about to break. i'm wondering if staring at swells into the rising sun burns the image onto my retina or something. it's crazy. when i go to bed hours later i'm still seeing it. does this happen to anybody else? i've noticed this for a long time but i've never heard anybody mention it.