Try this relaxation technique with and without a pillow in order to see if laying flat gives you the best result.
Contact the part of you that’s always been inside, before you grew up, before you formed your personality and identity. Let go of your roles in life and let yourself just be a human animal, without a name or nationality. You can pick back up all those aspects of your identity later, for now they aren’t needed as you lie here in peace and quiet.
Enjoy the lightness and relaxation you experienced while laying down and keep some of it inside as you go about your business in the world.
Peace be with you. Namaste
By Michael Pravin from Chennai, India (Surya Namaskar) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons