There's lots of different styles of meditation. Tibetan monks I've spoken to have commented on this if it helps : posture is important, of you don't have a good

There's lots of different styles of meditation. Tibetan monks I've spoken to have commented on this if it helps : posture is important, of you don't have a good, alert, posture it can make an individual sleepy. Secondly you can meditate with your eyes very slightly open. Also, you can meditate with candles and other things and focus your eyes on the light of those.