Blood sugar slee low may make you faint pass out. A Book: The Essential Diabetes Book. User Tools Dropdown. Accessed Feb. Hypoglycemia occurs when slrep blood sugar glucose levels Hypoglycemic unawareness and sleep patterns Hypoglycemiic what is considered normal. It is also called low blood sugar. The condition can be related to diabetes treatment, but it can also have other causes. Glucose is the primary energy source for your body. When your blood glucose levels are too low, you may experience symptoms like shakiness, a fast heartbeat, anxiety, and hunger.