Density differences between intrathecal injectate and CSF may explain the observed postural differences in extent of sensory block. Thus, the height of spinal anesthesia blockade could be affected by patient positioning during and after spinal injection. A small incline in positioning immediately after spinal injection may slow the rise of spinal blockade without affecting the duration of spinal anesthesia. In the current protocol, the investigators hypothesize that by slowing the rise of spinal anesthesia, the investigators might reduce the severity of hypotension.