The Science Behind Sleep Cycles Sleepyhead NZ(09) Johathan Nienow 12 Mar 2026 Save Image Image gallery: Why Do I Lay My Arm Across My Head? The Surprising Science Behind This Common Sleep Pose
![Arm: Anatomy [+video] - Lecturio Medical](https://cdn.lecturio.com/assets/Anterior-view-of-the-right-arm-and-shoulder-joint-400x317.jpg "Arm: Anatomy [+video] - Lecturio Medical")
