Do not worry about them. When these thoughts do present themselves and you become aware of them, simply return to the repe- tition of the mental device. These other thoughts do not mean you are performing the technique incorrectly. They are to be expected. A comfortable posture is important so that there is no undue muscular tension.
Some methods call for a sit- ting position.
If you are lying down, there is a tendency to fall asleep. As we have noted previously, the various postures of kneeling, swaying, or sitting in a cross-legged position are believed to have evolved to prevent falling asleep. Keep them relaxed. Become aware of your breathing. Breathe easily and naturally.