Drowsiness, lethargy and coma are totally different!
Many people are plagued by lack of sleep, always feeling sleepy, very tired and easily sleepy every day, which usually gets better with more rest. However, if it persists for a longer period of time, it is very likely to be drowsiness, somnolence or coma, which are commonly associated with metabolic disorders, endocrine system disorders, cranio-cerebral disorders and medications, etc. Drowsiness, somnolence and coma are often confused, but in fact they are completely different.