Yogi: I used too much energy trying not to move in the night sit and couldn’t sleep thereafter.
Sayadaw: Too much energy is not right. It’s not important whether you move or not during the sit. You need to know how much energy the mind uses. Only then can you apply the right amount of energy – not too much and not too little.
Posture is not very important; whether you move or not is also not very important. What is important is how much energy the mind uses. If you have too much energy and the mind notices, that’s good. Then, the mind can let go.
Over or less, these are two extremes. But you need to learn that this is too much and that’s too little; slowly, you can find the middle way, the balance. Only understanding can see the balance.
First, awareness sees ‘This is too much and that’s too little.’ After you learn from many experiences, slowly, the mind understands.