True meditation can only be achieved after your Kundalini awakens. Meditation means thoughtless awareness. Kundalini brings you to this state automatically.
You feel cool or warm breeze on top of your head and completely relaxed.
Warm breeze in the left hand means, you are emotional and thinking of past too much.
Warm breeze in the right hand means, you are stressful and thinking of future too much.
You feel cool breeze in both hands when you are in complete balance emotionally and mentally.