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.
It is a common problem that arm falls asleep at night, this is mostly because you keep your arms above the level of the heart, this position prevents the blood perfusion of the hands leading to numbness, tingling or partial paralysis of your arms. Carpal tunnel syndrome is another cause of this problem.