In spite of its name, NS-RED is not, strictly speaking, an eating disorder. It is thought to be a type of sleep disorder in which people eat while seeming to be sound asleep. They may eat in bed or roam through the house and prowl the kitchen. They are not aware they are eating. They have fragmentary or no memories of having done so when then wake.
Episodes probably occur in a state somewhere between wakefulness and sleep.
When people with NS-RED awake and discover the evidence of their nighttime forays, they are embarrassed, ashamed, and afraid they may be losing their minds. Some, when confronted with the evidence by family members, deny that they were the perpetrators. They truly do not believe they could have done such a thing and cannot admit to such dramatic loss of control. One to three percent of the general population seems to be subject to this disorder, and ten to fifteen percent of people with eating disorders are affected. The problem may be chronic or appear once or twice and then disappear.