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 Research in the 1990s using positron emission tomography (PET) confirmed the role of the brain stem and suggested that, within the forebrain, the limbic and paralimbic systems showed more activation than other areas.[1] The areas activated during REM sleep are approximately inverse to those activated during non-REM sleep[10] and display greater activity than in quiet waking. The "anterior paralimbic REM activation area" (APRA) includes areas linked with emotion, memory, fear and sex, and may thus relate to the experience of dreaming during REMS.[9][15] More recent PET research has indicated that the distribution of brain activity during REM sleep varies in correspondence with the type of activity seen in the prior period of wakefulness.[1]