When you sleep on it, do you get tingling or numb arms? There may be something happening. It’s not always possible to sleep in the most comfortable posture.
Stretched over the bed, slumped in a chair, resting on your desk, or even standing up, you may sometimes be in the fetal position.
I can tell you that it is possible since my brother once slept off while standing in the shower. However, you often have a few aches and pains when you wake up, which go away over the day.
You may sometimes have a stiff and sore neck for more than a day, but this is not cause for concern.
You may have health issues, however, if you often experience tingling or numbness in your arm when you sleep on it.