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1. Circadian Rhythms:

The body has an internal clock known as the circadian rhythm that regulates sleep-wake cycles.
The circadian rhythm tends to align with natural light-dark cycles, making earlier bedtimes, such as before 10 pm, more conducive to optimal sleep.

2. Healthy Sleep Habits:

National Sleep Foundation and American Academy of Sleep Medicine stress the importance of adopting healthy sleep habits, including consistent sleep schedules.
Going to bed before 10 pm is often recommended to ensure an adequate duration of sleep, as sleep needs vary among individuals.

3. Sleep Duration Recommendations:

The CDC provides sleep duration recommendations for different age groups, highlighting the significance of getting enough sleep for overall health and well-being.

4. Scientific Studies:

Scientific studies, such as those by Crowley et al. and Czeisler & Klerman, discuss the connection between circadian rhythms and sleep regulation, supporting the idea that aligning bedtime with natural biological rhythms can be beneficial.

5. General Consensus:

The general consensus from these sources is that earlier bedtimes, particularly before 10 pm, can contribute to better sleep quality and overall health.

References

Here are some references and sources that discuss the importance of early bedtime for better sleep:

1. National Sleep Foundation:

Website: https://www.sleepfoundation.org/
The National Sleep Foundation provides information on sleep hygiene and the importance of maintaining a consistent sleep schedule.

2. American Academy of Sleep Medicine:

Website: https://aasm.org/
The AASM is a professional society that focuses on sleep medicine. They provide resources and information on healthy sleep habits.

3. Healthy Sleep Tips – Centers for Disease Control and Prevention (CDC):

Website: https://www.cdc.gov/sleep/index.html
The CDC offers information on sleep duration recommendations and tips for healthy sleep.

4. Sleep Education – Sleep Foundation:

Website: https://sleepeducation.org/
Sleep Education, a division of the Sleep Research Society, provides educational resources on sleep and sleep disorders.

5. Scientific Studies:

(i) Crowley, S. J., Acebo, C., & Carskadon, M. A. (2007). Sleep, circadian rhythms, and delayed phase in adolescence. Sleep Medicine, 8(6), 602-612. DOI: 10.1016/j.sleep.2006.12.002

(ii) Walker, M. P. (2017). Why We Sleep: Unlocking the Power of Sleep and Dreams. Scribner.

(iii) Czeisler, C. A., & Klerman, E. B. (1999). Circadian and sleep-dependent regulation of hormone release in humans. Recent Progress in Hormone Research, 54, 97-130. DOI: 10.1210/rp.54.1.97

Krishna describes the set-up of the meditation yoga process in great detail. He delineates the importance of both the internal and external modifications to make this process successful. We sequentially enumerate these details as follows:

1. BG 6.10: Externally, one should resign from active life and go to a secluded place (rahasi sthitaḥ), and stay alone (ekākī). Internally, one should constantly engage the body, mind, and self (ātmānaḿ), and become free from desires and possessiveness (nirāśīr aparigrahaḥ).
2. BG 6.11-12: Externally, one should reside in a sacred place (śucaudeśe), firmly fixed (sthiram) on a seat neither too high nor too low (nāty-ucchritaḿ nāti-nīcaḿ), with kuśa grass covered over by soft cloth and deerskin (cailājina-kuśottaram). Internally, the mind should be fixed on one point (tatraikāgraḿ manaḥ kṛtvā); with the mind and senses controlled (yata-cittendriya-kriyaḥ), one should practice yoga to purify the heart (ātma-viśuddhaye).
3. BG 6.13-14: Externally, the body, head, and neck should be aligned in a straight line (samaḿ kāya-śiro-grīvaḿ) at all times. Internally, one should approach the divinity with an unagitated mind (praśāntātmā), free from fear (vigata-bhī), fixed in the vow of celibacy (brahmacāri-vratesthitaḥ), with the mind subdued (manaḥ saḿyamya), meditating on Krishna (mac-citta), making Krishna the ultimate goal of life (yuktaāsīta mat-paraḥ).

When this process is done with a regulated mind, the result is (i) peace (śāntiḿ), (ii) cessation of material existence (nirvāṇa-paramāḿ), ultimately (iii) attainment of Krishna’s abode (mat-saḿsthāmadhigacchati). (BG 6.15)

What are the preconditions for the meditation yoga to give the practitioner freedom from miseries?

There are four sources of energy operative in one’s life: eating, sleeping, breathing, and meditation. Regulation in eating (āhāra), sleeping (svapna), recreation or breathing (vihāra), meditation (avabodha), and all endeavors (karma) when done in relation with the Supreme Lord (yukta) will give one freedom from miseries by the practice of the meditation yoga. (BG 6.16–17)