There are many reasons for feeling tired and wanting to sleep. The first and most common is because the work is more stressful, work long hours, sleep deprivation, this time there will certainly be mental depression, want to sleep, very tired. In addition, summer dampness is heavy, and then go swimming, or often drink cold beer, drinks, chilled food, this time the dampness is too heavy, will also appear sleepy, want to sleep. The third condition is not good liver, such as chronic hepatitis B, alcoholic liver, hepatitis, cirrhosis of the liver, these conditions, will also appear very sleepy, want to sleep sleep can not wake up. Whether there is liver disease is mainly through the examination of liver function, or hepatitis B and half or hepatitis typing, liver ultrasound, these can be differential diagnosis. So the best way is to go to the hospital to do the relevant tests to rule out liver disease first. If there is nothing wrong with the liver, just simple fatigue, it is recommended to keep enough sleep time and rest time, which will improve.