What causes light sleep?

The clinical manifestation of light sleep causes and acute stress factors, especially in the transient, excessive excitement, anxiety, mental stress state, showing transient short sleep. Light sleep easy to dream, and physical discomfort, or sleep environment changes, also easy to lead to light sleep. In terms of drugs, such as stimulating, excitatory drugs, can also lead to light sleep, such as caffeine, theophylline, cocaine, hormones or anti-tremor, paralytic drugs, etc. In addition, psychological factors, especially excessive defense against sleep, often subconsciously lead to insecurity about sleep, easy to show a state of light sleep. Some mental disorders, such as mania, depression, and schizophrenia, are also prone to light sleep, which is the main cause of light sleep.