There are six factors that can induce sleeping problems.
1. Diseases of the central nervous system in which the parts of the brain that participate in the regulation of sleep and awakening are damaged. This causes real insomnia but accounts for only a small percentage of ah people suffering from sleeping problems .
2. Diseases of internal organs or peripheric nerves where pain or other unpleasant feelings disturb normal sleep. This can be anything from asthma symptoms (or anticipation of them) to muscle cramps, and can deprive you of sleep for a long time.
3. Neurotic disorders and functional disorders affecting the nervous system. Sufferers from emotional problem(including mood swings), people who are obsessed with disease or those who have a tendency to worry unduly make up this group.
4. Psychiatric diseases can affect sleep centres in the core of the brain, causing very unusual sleep patterns. Schizophrenics may be asleep or awake regardless of day or night, experiencing a sort of sleeping fit. Those who suffer from depression also need less sleep than others, despite the fact that they long for sleep as a means of forgetting their worries, at least for a while.
5. Changes of environment such as changes in the weather, sleeping in a different place, entering a different time zone and new working shifts can cause temporary sleep problems.
6. Drug abuse, whether medical or illegal.