Answer:
True
Explanation:
It's True
There can be phases of sleep, one of them is the phase of REM or Rapid Eye Movement, once we reach this stage of active sleep, and our muscles lose tonality, making it very difficult to maintain a sitting position. Our shoulders continue to stretch or slip to the other side as we sit upright, which can cause pain. There are also other concerns but it should also be remembered that an adult needs to sleep upright under certain circumstances.
