An EDR reader wrote that in her anorexic phase she is afraid to sleep because in sleep she won't burn off enough calories. In her bulimic phase she eats to pass out. In other words, she never gets normal good, deep, restorative rest.
The sleep and sleep deprivation issue are important to explore and understand in working toward eating disorder recovery.
In the reader's post she describes how her anorexic and bulimic phases bring up different psychological motivations and behaviors.