Sleep onset Insomnia

Sleep onset insomnia, defined as difficulty initiating asleep, is a common disorder with associated impairment or significant distress and is associated with daytime consequences. Although these sleep onset insomnia has generally been attributed to psychological or psychiatric causes, it can also be secondary to a medical, circardian, or sleep disorder. Usually, many patients have various causes or conditions such as psychophysiological insomnia (PPI), periodic limb movements in sleep (PLMS), restless legs syndrome (RLS), obstructive sleep apnea-hypopnea syndrome (OSAS), congestive heart failure (CHF), delayed sleep phase syndrome (DSPS), etc. These patients are characterized by frequent arousals or failing to get to sleep in the early sleep stage and don't feel refreshed in the morning.