When you keep your eyes half open, it is called a lion's meditation. At that time, you are conscious of two worlds: the spiritual world and the physical world. It is not that you are at times on a lower level or on a higher level, no. When you keep your eyes half open while meditating, you are seeing the highest level of consciousness and at the same time you are trying to transform the earth-consciousness.
If you keep your eyes wide open and you are only conscious of what is happening here around you, then if a cat is walking around the room, immediately your concentration is gone and you are lost. Again, if you keep your eyes closed while meditating, you may think that you have meditated for twenty-four hours while all the time you have really been sleeping. At night if you keep your eyes closed and just lie down on your bed to meditate, you may think that you had a most sublime meditation, that you entered into trance. No, far from it. You have to know that there is a great difference between sleep and meditation. Self-deception may overtake you when you meditate with your eyes closed. There are many ways you can fool yourself and convince yourself that you had a wonderful meditation. But if you keep your eyes half open, then at that time you become the true judge.From:Sri Chinmoy,Philosophy, religion and yoga, Agni Press, 1980
Sourced from https://srichinmoylibrary.com/pry