We have all experienced times in our lives when we felt extremely tired for one reason or another. But, there is a big difference between being very tired and having a disorder which is known as hypersomnia.
Hypersomnia is a type of sleeping disorder whereby a person literally has trouble staying awake at virtually any time of the day. This is far from excessive sleepiness which can be the result of lack of sleep – and is considered to be an actual disorder.