Sleep-Onset Insomnia
Sleep-onset insomnia, also referred to as initial insomnia, is a common sleep disorder defined by difficulty initiating sleep at bedtime. Despite sufficient opportunity and a…
Sleep Maintenance Insomnia
Sleep maintenance insomnia, also known as middle insomnia, is a chronic sleep disorder marked by frequent nighttime awakenings and difficulty returning to sleep. Unlike sleep-onset…
Severe Insomnia
Severe insomnia is a complex and persistent sleep disorder characterized by difficulty initiating or maintaining sleep, or by waking too early and being unable to…