which is the best direction to put head while sleeping
Sleeping positions The Indian Vastu Shastra and Chinese Feng shui systems describe favorable and unfavorable geographical directions (north, south, east, west) for sleeping. Vastu Shastra suggests not to sleep towards South for people living in Northern hemisphere and not towards North in case of Southern Hemisphere. Blog by Sadhguru (Isha Foundation) quotes, "East is the worst direction. North-east is okay. West is alright. South, if you must. North, best . This is true as long as you are in the northern hemisphere – sleeping with your head towards any side except north is okay. In the southern hemisphere, don’t put your head to the south."[7]
Rapid eye movement sleep Generally speaking, the body suspends homeostasis during paradoxical sleep. Heart rate, cardiac pressure, cardiac output, arterial pressure, and breathing rate quickly become irregular when the body moves into REM sleep.[32] In general, respiratory reflexes such as response to hypoxia diminish. Overall, the brain exerts less control over breathing; electrical stimulation of respiration-linked brain areas does not influence the lungs, as it does during non-REM sleep and in waking.[33] The fluctuations of heart rate and arterial pressure tend to coincide with PGO waves and rapid eye movements, twitches, or sudden changes in breathing.[34]