The subjective impression that everyone else sleeps well is not true though. Scientific studies in many western countries show:
- In the adult population, about one third is suffering from temporar sleep disturbances. About one in ten is suffering from a chronic sleep disorder which is also affecting the persons mood and efficiency daytime.
- About five percent suffer from excessive sleepiness at daytime (hypersomnia).
- Sleep disturbances is thereby ranked (apart from headache) as one of the most common psychosomatic disturbances.
This information was taken from the site "www.disturbedsleep.de" (in german), where it is possible to find more information about causes and how common sleep disturbances are.