Ever noticed when you meditate, as in simple meditation (closing your eyes and think of nothing/staring at the darkness), your eyes just slowly automaticlyy open. Why does this happen? It does happen to me.
Happens to me too and its really annoying in the daytime when Im trying to focus and i keep seeing this light barge into my darkness at the bottom of my eyelids. Just shut them without thinking about it and continue on, or put some cloth over your eyes like a shirt or bandanna.