The Yoga Sutras Of Patanjali - Samadhi Pada
Other distractions are sorrow, Despair, anxiety, improper breathing and an unfocused mind.
To prevent this follow a devotional one pointed practice.
A peaceful tranquility surfaces when we encourage joy, happiness
and virtue. Detach from pain, sorrow, vice and suffering.
After exhalation, during the stillness before inhalation,
there is calmness. This can remove distractions.
Or by unifying the mind with an object.
Or by removing all sorrow and meditating on a shining state of illumination within.
Or by contemplating sages.
Or by inquiry into day dreaming, dreams from sleep and states of awakening.
Or by meditating upon something of our liking that is in harmony with the path.
When progressed the mind will understand all there is to be known.
From the smallest particle to that which is vast and distant.