For example, allergic reactions to food allergens may also be present. These often lead to falling asleep and staying asleep, which are not recognized for a long time. Gastroesophageal reflux (nocturnal heartburn) also leads to sleep disorders. Nakolepsia is a disease in which people fall into a brief deep sleep within seconds. This can of course be very dangerous when cycling or driving a car. Every form of depression is associated with a sleep disorder. Depression is a serious condition requiring treatment. Furthermore, internal sleep disorders are also the obstructive sleep apnea syndrome or the delayed sleep syndrome. People with a long-term excessive consumption of, for example, alcohol painkillers, Sleeping pills and drugs have both impaired and insomnia. Today there are specialist clinics that deal with this topic.
Among the internal diseases that can cause sleep disorders include sleep-related asthma, diabetes mellitus, chronic renal insufficiency, chronic fatique syndrome, fibromyalgia syndrome, hyper- and hypothyroidism (overactive and hyperthyroidism).