There is no clear reason why you like to sleep with your hands on top of your head, it’s just a matter of your sleeping habits, but it’s not recommended that you keep this sleeping position. In neurology, we often encounter many patients who cannot lift their arms the next day after sleeping, and then we ask them what kind of sleeping position they usually like to keep. The reason why the hand cannot be raised is that electrophysiological examination, that is, electromyography, suggests damage to the brachial plexus nerve. So it is recommended that you do not sleep with your hands on top of your head and on the back of your head pillow, which can cause easily cause brachial plexus nerve damage. If you fall asleep, you are not very conscious and can easily compress the nerve.