There are many reasons for feeling sleepy all the time, first of all, some people have poor sleep habits, such as lack of sleep at night or irregular sleep time, in addition to sleep disorders can also cause feeling sleepy all the time. For example, sleep apnea, a short period of respiratory arrest during sleep, and episodic sleeping sickness, such as being very sleepy during the day, sometimes falling asleep suddenly during normal activities, and long-term difficulty falling asleep or maintaining sleep with early awakening. Insomnia caused by this condition can also be caused by feeling sleepy all the time. Other conditions such as hypothyroidism, where the thyroid gland is unable to produce sufficient amounts of thyroid hormones. The thyroid hormones control the body’s use of energy, so hypothyroidism can cause sleepiness and fatigue all the time. In addition, some patients experience depression, feeling sad and depressed most of the time, which can often interfere with work and daily tasks due to sleepiness. In addition, there are some factors that prevent sleep, such as obvious noise in the sleeping environment, and some that affect sleep because of health problems, such as restless legs syndrome or severe cramps at night, and even some people often feel sleepy due to night shift work or changing time zones, or using certain medications that affect sleep, resulting in feeling very sleepy and seriously affecting the quality of life, and should go to a neurologist to help clarify the cause of the diagnosis and treat accordingly.