Sandstone: Rock for Crack Climbing. Sandstone is a sedimentary rock, a rock type that encompasses a wide variety of characteristics and is deposited directly on the earthâs surface. Roughly 75% of the earthâs land surface is covered with some type of sedimentary rock. Sedimentary rocks like sandstone form when minute rock particles, often from granite, are deposited by wind and water on earth surfaces.
8. 1  Other Causes. 2  Diabetes causes arms or hands and feet to fall asleep even when one is awake and relaxed. 3  Hand surgery and arthritis damage or irritate the nerves.
High levels of cortisol interfere with restorative REM sleep and interrupt sleep rhythms. This is why so many women in perimenopause report that they are able to fall asleep, but they cannot stay asleep. High cortisol levels can also cause racing, panicky thoughts, heart palpitations, and even panic attacks.