The most common organic cause of drowsiness and poor memory is mainly seen in sleep apnea hypoventilation syndrome, which is also known as snoring in folklore. Why would this happen, because snoring at night will appear sleep apnea, after the pause will appear brain hypoxia, prolonged brain hypoxia will cause drowsiness the next day, sleep disorders at night will appear daytime drowsiness, and then mental concentration, poor memory, the formation of chronic brain hypoxia for a long time will cause gradual memory loss, chronic brain damage appears. In this case, we can do a sleep apnea monitoring to see if there is hypoventilation at night, and if this happens, you can go to a specialist is the ENT department to see what causes it. In some cases, the problem can be solved surgically, and in some cases, it cannot be solved surgically, so a portable ventilator can be applied and worn at night to solve the problem.