Hypersomnia is a very rare sleep disorder that is said to only affect 200 people in the world today. The disorder is made up of periods of severe sleepiness. These periods of sleep can last for up to 18 hours a day and can go on for days and even weeks. It is said though, that only about 10 attacks occur per year. Before a person is hit with a hypersomnia attack, there are usually flu like symptoms present and a long-lasting headache. The attack itself can cause a person to gain weight and sweat profusely. Kleine-Levin Syndrome is marked by hypersomnia with odd behavior during the attacks, such as binge eating, aggression, confusion, hallucinations, and hypersexuality. There is also Menstrual-Related Hypersomnia which is said to be caused by hormonal imbalances.
4.REM-Sleep Behavior Disorder (RBD)
REM-Sleep Behavior Disorder (RBD) is classified under the sleep disorder category of parasomnia. A parasomnia is when undesired events occur while sleeping. This disorder is said to cause people to act out extremely vivid dream while sleeping. RBD is usually confused with sleepwalking, sleep terrors, as well as sleep-talking. A lot of the time these dreams are full of action and sometimes violent. RBD is marked by swearing, shouting, flailing, kicking, and doing actions as if someone is fighting. If not treated, RBD can get worse and more violent. The disorder is mainly seen in men that are suffering from multiple system atrophy or Parkinson's.
3.Exploding Head Syndrome
Exploding head syndrome is another parasomnia that causes the person to hear a loud noise just before falling asleep. Though it sounds like something you'd see in a movie, the disorder is real and often occurs while waking up in the middle of the night. Many times the sound reflects the sound of a bomb exploding or a loud banging noise. These sounds cause a lot of distress and often disturb sleep. Not many cases of this disorder are reported, but patients as young as 10 have been diagnosed with it.
Sleep paralysis is marked by the ability to not move the body when falling asleep or when waking up from sleeping. When sleeping, the body experiences atonia, which is when the body is told to relax and be still. However, in sleep paralysis, atonia occurs when waking up or when falling asleep, instead of during sleep. In some cases people cannot move or even speak, but they are fully aware of what is going on. Sleep paralysis can last for several minutes, but usually goes away on its own. Some believe that the problem is common; saying that up to 40% of the population experiences the disorder. The good news is it isn't harmful and certain actions can sometimes help reduce or eliminate sleep paralysis.
1.Non-24-Hour Sleep-Wake Syndrome
Non-24-Hour Sleep-Wake Syndrome is one of the rarest sleep disorders doctors have ever come across. As humans we have a circadian rhythm that is said to roughly correlate with the 24 hours in a day. Of course there are variances from person to person, but usually people have a circadian rhythm of about 24-25 hours. However, people with this disorder do not have stable "body clocks." Instead the rhythm becomes delayed and set on 26 hours or longer. Some people even have 72 hour cycles as a regular daily pattern. Someone with a 72 hour cycle would be awake for 48 hours, and those with a 26 hour cycle will usually be awake for about 16. Generally people with the disorder sleep for about 2 hours longer compared to a normal wake time. Those who are blind often suffer from Non-24-Hour Sleep-Wake Syndrome.