Most of the drowsiness in a day is caused by the slowing down of blood circulation and the brain cells are in a chronic lack of oxygen. It can be seen in people who are obese, usually eat too greasy food, or the elderly due to atherosclerosis resulting in slowed blood flow, brain cells are in a chronic lack of oxygen process, can appear sleepy. It can also be seen in patients who have short sleep time at night or poor sleep quality, and appear sleepy during the day. It can also be seen as a result of pathological conditions, such as periodic sleeping sickness, which results from damage to the brainstem or mesencephalon. There is a clinical disease called fat sleeping disorder, but the obese people suffer from the disease, mostly seen in men in their 40s, mostly special obese body type, the patient shows as fast asleep, but snoring loud sleep is shallow, more sleepy in a day, the patient can be given an electroencephalography if necessary.