232
Śrīmad-Bhāgavatam
[Canto 7, Ch. 15]
chanting the Hare Kṛṣṇa  mantra  one may observe regulative principles. Thus while sitting and chanting one may keep his body straight, and this will help one in the chanting process; otherwise one may feel sleepy.
TEXTS 32–33
प्राणापानौ सन्निरुन्धात् पूरकुम्भकरेचकैः । 
    यावन्मनस्त्यजेत् कामान् स्वनासाग्रनिरीक्षणः ॥ ३२ ॥ 
    यतो यतो निःसरति मनः कामहतं भ्रमत् । 
    ततस्तत उपाहृत्य हृदि रुन्ध्याच्छनैर्बुधः ॥ ३३ ॥
prāṇāpānau sannirundhyāt 
    pūra-kumbhaka-recakaiḥ 
    yāvan manas tyajet kāmān 
    sva-nāsāgra-nirīkṣaṇaḥ
yato yato niḥsarati 
    manaḥ kāma-hatam bhramat 
    tatas tata upāhṛtya 
    hṛdi rundhyāc chanair budhaḥ
prāṇa—incoming breath; apānau—outgoing breath; sanni- 
    rundhyāt—should stop; pūra-kumbhaka-recakaiḥ—by inhaling, exhal- 
    ing and holding, which are technically known as pūraka, kumbhaka and 
    recaka; yāvat—so long; manaḥ—the mind; tyajet—should give up; 
    kāmān—all material desires; sva—one's own; nāsa-agra—the tip of the 
    nose; nirīkṣaṇaḥ—looking at; yataḥ yataḥ—from whatever and 
    wherever; niḥsarati—withdraws; manaḥ—the mind; kāma-hatam— 
    being defeated by lusty desires; bhramat—wandering; tataḥ tataḥ— 
    from here and there; upāhṛtya—after bringing it back; hṛdi—within 
    the core of the heart; rundhyāt—should arrest (the mind); śanaiḥ— 
    gradually, by practice; budhaḥ—a learned yogī.
TRANSLATION
While continuously staring at the tip of the nose, a learned yogī practices the breathing exercises through the technical means