Extravagance in the matter of eating, sleeping, defending and mating—which are demands of the body—can block advancement in the practice of yoga. As far as eating is concerned, it can be regulated only when one is practiced to take and accept prasādam, sanctified food. Lord Kṛṣṇa is offered, according to the Bhagavad-gītā (B.G.9:26), vegetables, flowers, fruits, grains, milk, etc. In this way, a person in Kṛṣṇa consciousness becomes automatically trained not to accept food not meant for human consumption, or not in the category of goodness. As far as sleeping is concerned, a Kṛṣṇa conscious person is always alert in the discharge of his duties in Kṛṣṇa consciousness, and therefore any unnecessary time spent sleeping is considered a great loss. Avyartha-kālatvam: (CC.2:23:18-19) a Kṛṣṇa conscious person cannot bear to pass a minute of his life without being engaged in the service of the Lord. Therefore, his sleeping is kept to a minimum. His ideal in this respect is Śrīla Rūpa Gosvāmī, who was always engaged in the service of Kṛṣṇa and who could not sleep more than two hours a day, and sometimes not even that. Ṭhākura Haridāsa would not even accept prasādam nor even sleep for a moment without finishing his daily routine of chanting with his beads three hundred thousand names.
(Bhagavad-Gita-------6:17--------purport).

The wife is the cause of all kinds of success in religion, economic development, sense gratification and ultimately salvation. When one accepts a wife, it is to be understood that he is being helped in his progressive march toward liberation. In the beginning of life a person is trained as a brahmacārī and is then allowed to marry a suitable girl and become a householder. If one is thoroughly trained in household life, he finds all facilities for human life-eating, sleeping, mating and defending. Everything is there if it is executed according to regulative principles.
(Srimad Bhagavatam-------4:25:37-------purport).

As long as the material body exists, one has to meet the demands of the body, namely eating, sleeping, defending and mating. But a person who is in pure bhakti-yoga, or in Kṛṣṇa consciousness, does not arouse the senses while meeting the demands of the body. Rather, he accepts the bare necessities of life, making the best use of a bad bargain, and enjoys transcendental happiness in Kṛṣṇa consciousness. He is callous toward incidental occurrences—such as accidents, disease, scarcity and even the death of a most dear relative—but he is always alert to execute his duties in Kṛṣṇa consciousness, or bhakti-yoga. Accidents never deviate him from his duty. As stated in the Bhagavad-gītā (B.G.2:14), āgamāpāyino 'nityās tāṁs titikṣasva bhārata. He endures all such incidental occurrences because he knows that they come and go and do not affect his duties. In this way he achieves the highest perfection in yoga practice.
(Bhagavad-Gita-------6:23--------purport).

Humanity may be divided into two sections, namely, the regulated and the nonregulated. Those who are engaged simply in bestial sense gratifications without knowledge of their next life or spiritual salvation belong to the nonregulated section. And those who follow the principles of prescribed duties in the scriptures are classified amongst the regulated section. The nonregulated section, both civilized and noncivilized, educated and noneducated, strong and weak, are full of animal propensities. Their activities are never auspicious, because while enjoying the animal propensities of eating, sleeping, defending and mating, they perpetually remain in material existence, which is always miserable. On the other hand, those who are regulated by scriptural injunctions, and who thus rise gradually to Kṛṣṇa consciousness, certainly progress in life.
(Bhagavad-Gita-------6:40--------purport).

Material life means being fully absorbed in eating, sleeping, mating and defending. Out of these, sleep is taken very seriously. While asleep, one completely forgets the object of life and what to do. For spiritual realization, one should try to avoid sleep as much as possible. The Gosvāmīs of Vṛndāvana practically did not sleep at all. Of course, they slept some, for the body requires sleep, but they slept only about two hours, and sometimes not even that. They always engaged in spiritual cultivation. Nidrāhāra-vihārakādi-vijitau **. Following in the footsteps of the Gosvāmīs, we should try to reduce sleeping, eating, mating and defending.
(Srimad Bhagavatam-------5:14:20-------purport).

There are various grades of men, and out of many thousands, one may be sufficiently interested in transcendental realization to try to know what is the self, what is the body, and what is the Absolute Truth. Generally mankind is simply engaged in the animal propensities, namely eating, sleeping, defending and mating, and hardly anyone is interested in transcendental knowledge. The first six chapters of the Gītā are meant for those who are interested in transcendental knowledge, in understanding the self, the Superself and the process of realization by jñāna-yoga, dhyāna-yoga and discrimination of the self from matter.
(Bhagavad-Gita-------7:3--------purport).

Material sense gratification is also called grāmya, and the place where sex life is indulged in to a great extent is called Grāmaka. When going to Grāmaka, Purañjana used to be accompanied by his friend Durmada. The word viṣaya refers to the four bodily necessities of life—eating, sleeping, mating and defending. The word durmadena may be analyzed in this way: dur means duṣṭa, or "sinful," and mada means "madness." Every living entity who is in contact with material nature is called mada, or mad.
(Srimad Bhagavatam-------4:25:52-------purport).

One who does not develop knowledge through the authorities or scriptural injunctions has knowledge that is limited to the body. He is not concerned about acting in terms of the directions of scripture. For him God is money, and knowledge means the satisfaction of bodily demands. Such knowledge has no connection with the Absolute Truth. It is more or less like the knowledge of the ordinary animals: the knowledge of eating, sleeping, defending and mating.
(Bhagavad-Gita-------18:22--------purport).

Persons who cannot think of anything beyond the limit of their own power are like frogs in a well who cannot imagine the length and breadth of the great Pacific Ocean. Such people take it as legendary when they hear that the Supreme Lord is lying on His bed within the great ocean of the universe. They are surprised that one can lie down within water and sleep very happily. But a little intelligence can mitigate this foolish astonishment. There are many living entities within the bed of the ocean who also enjoy the material bodily activities of eating, sleeping, defending and mating. If such insignificant living entities can enjoy life within the water, why can't the Supreme Lord, who is all-powerful, sleep on the cool body of a serpent and enjoy in the turmoil of violent ocean waves? The distinction of the Lord is that His activities are all transcendental, and He is able to do anything and everything without being deterred by limitations of time and space. He can enjoy His transcendental happiness regardless of material considerations.
(Srimad Bhagavatam-------3:9:20-------purport).

The human being is endowed with a higher, advanced stage of consciousness for getting relief from the existence of material miseries, but due to his ignorance he thinks that his higher consciousness is meant for advancing in the material comforts of life. Thus his intelligence is misused in the animal propensities—eating, sleeping, defending and mating—instead of spiritual realization. By advancing in material comforts the human being puts himself into a more miserable condition, but, illusioned by the material energy, he always thinks himself happy, even while in the midst of misery. Such misery of human life is distinct from the natural comfortable life enjoyed even by the animals.
(Srimad Bhagavatam-------3:10:26-------purport).

The essence of household life is sense enjoyment, and as long as one engrosses his mind in working hard for sense enjoyment, one becomes bound by the reactions of fruitive activities. This ignorance of self-realization is the greatest defeat in human life. The human form of life is especially meant for getting out of the bondage of fruitive activities, but as long as one is forgetful of his life's mission and acts like an ordinary animal—eating, sleeping, mating and defending—he must continue his conditioned life of material existence. Such a life is called svarūpa-vismṛti, forgetfulness of one's real constitutional position.
(Srimad Bhagavatam-------5:1:1-------purport).

The little taste experienced in sex is our desire to enjoy another's wife, and the flies are the guardians of women, like the husband, father-in-law, mother-in-law and so forth. The creeper itself is women in general. The lion is the wheel of time, and the herons, crows and vultures are so-called demigods, pseudo svāmīs, yogīs and incarnations. All of these are too insignificant to give one relief. The swans are the perfect brāhmaṇas, and the monkeys are the extravagant śūdras engaged in eating, sleeping, mating and defending. The trees of the monkeys are our households, and the elephant is ultimate death.
(Srimad Bhagavatam-------5:14:46-------purport).

Eating, sleeping, defending and mating are the four principles of material bodily demands which are common to both the animals and human society. To distinguish human society from the animals there is the performance of religious activities in terms of the social statuses and orders of life. They are all clearly mentioned in the Vedic literatures and were manifested by Brahmā when the four Vedas were generated from his four mouths.
(Srimad Bhagavatam-------3:12:35-------purport).

Unless one is associated with devotees, he cannot cultivate Kṛṣṇa consciousness. Nirjana-bhajana—cultivating Kṛṣṇa consciousness in a solitary place—is not possible for the neophyte, for he will be disturbed by the bodily necessities (eating, sleeping, mating and defending). Being so disturbed, one cannot cultivate Kṛṣṇa consciousness. We therefore see that devotees known as sahajiyā, who make everything very easy, do not associate with advanced devotees. Such persons, in the name of devotional activities, are addicted to all kinds of sinful acts—illicit sex, intoxication, gambling and meat-eating. There are many so-called devotees passing themselves off as devotees while engaging in these sinful activities.
(Srimad Bhagavatam-------4:29:41-------purport).

Those who are interested in reviving Kṛṣṇa consciousness and increasing their love of Godhead do not like to do anything that is not related to Kṛṣṇa. They are not interested in mingling with people who are busy maintaining their bodies, eating, sleeping, mating and defending. They are not attached to their homes, although they may be householders. Nor are they attached to wives, children, friends or wealth. At the same time, they are not indifferent to the execution of their duties. Such people are interested in collecting only enough money to keep the body and soul together.
(Srimad Bhagavatam-------5:5:3-------purport).

The principles of animal life—eating, sleeping, mating and defending—are actually necessities of the body, but those who engage in transcendental Kṛṣṇa consciousness, giving up all the stereotyped activities of this material world, are freed from social conventions. Conditioned souls are under the spell of material energy, or eternal time—past, present and future—but as soon as one engages in Kṛṣṇa consciousness, he transcends the limits of past and present and becomes situated in the eternal activities of the soul.
(Srimad Bhagavatam-------3:21:17-------purport).

In order to find freedom from the stereotyped conditional life of material existence, one has to take shelter of the lotus feet of the Lord, not in the manner in which the impersonalists indulge, but in devotional service, chanting and hearing of the activities of the Lord. Only then can one be freed from the actions and reactions of material existence. It is recommended here that one should give up the conditional life of this material world and the association of so-called civilized human beings who are simply following, in a polished way, the same stereotyped principles of eating, sleeping, defending and mating. Chanting and hearing of the glories of the Lord is described here as tvad-guṇa-vāda-sīdhu. Only by drinking the nectar of chanting and hearing the pastimes of the Lord can one forget the intoxication of material existence.
(Srimad Bhagavatam-------3:21:17-------purport).

Unless one can train a child for liberation in that life, there is no need to marry or produce children. If human society produces children like cats and dogs for the disturbance of social order, then the world becomes hellish, as it has in this age of Kali. In this age, neither parents nor their children are trained; both are animalistic and simply eat, sleep, mate, defend, and gratify their senses. This disorder in social life cannot bring peace to human society.
(Srimad Bhagavatam-------3:22:19-------purport).

Animals in bodies lower than that of the human being are conscious only as far as their bodily distress and happiness are concerned; they cannot think of more than their bodily necessities of life-eating, sleeping, mating and defending. But in the human form of life, by the grace of God, the consciousness is so developed that a man can evaluate his exceptional position and thus realize the self and the Supreme Lord.
(Srimad Bhagavatam-------3:31:19-------purport).

When one engages in devotional service in Kṛṣṇa consciousness, he still has to eat, sleep, defend and mate because these are necessities of the body. But he performs such activities in a regulated way. He has to eat kṛṣṇa-prasāda. He has to sleep according to regulated principles. The principle is to reduce the duration of sleep and to reduce eating, taking only what is needed to keep the body fit. In short, the goal is spiritual advancement, not sense gratification. Similarly, sex life must be reduced. Sex life is meant only for begetting Kṛṣṇa conscious children.
(Srimad Bhagavatam-------3:33:26-------purport).

All Vedic civilization is summarized in this verse: all living entities, either on this planet or on other planets, have to satisfy the Supreme Personality of Godhead by their respective duties. When He is satisfied, all necessities of life are automatically supplied. In the Vedas it is also stated: eko bahūnāṁ yo vidadhāti kāmān (Kaṭha Upaniṣad 2.2.13). From the Vedas we understand that He is supplying everyone's necessities, and we can actually see that the lower animals, the birds and the bees, have no business or profession, yet they are not dying for want of food. They are all living in nature's way, and they all have the necessities of life provided—namely eating, sleeping, mating and defending.
(Srimad Bhagavatam-------4:14:20-------purport).

In the association of pure devotees, one becomes attached to hearing and chanting the glories of the Lord. In this way one can cultivate Kṛṣṇa consciousness, and as soon as this cultivation is advanced, one can become faithful to the Lord, devoted to the Lord and attached to the Lord, and thus one can very quickly attain full Kṛṣṇa consciousness. The secret of success in the cultivation of Kṛṣṇa consciousness is hearing from the right person. A Kṛṣṇa conscious person is never disturbed by the bodily necessities—namely eating, sleeping, mating and defending.
(Srimad Bhagavatam-------4:29:39-40-------purport).