If you are in the northern hemisphere, East is the best direction to keep your head when you sleep. Northeast is okay. West is alright. South, if you must. North, no. In the southern hemisphere, don’t put your head to the south. https://isha.sadhguru.org/us/en/wisdom/article/how-to-sleep-less
close right nostril and breath through left nostril and chant rammu like OM sound. for then release air through left nostril. do it 3 kalas 6 times each kala.. do it for 4 months.
The concept of Chakras can be found in certain Tantric texts such as Shat-Chakra-Nirupana and Padaka-Panchaka . https://mythrispeaks.wordpress.com/2017/03/08/should-women-chant-the-gayatri-mantra/