As the description from a dose of flu ,exhausted, become irritable when she starting sleep mode ,starving after "hibernation". Those symptom are pretty similar with Chinese Narcolepsy by insufficient of Spleen energy .
severe flu not only can damage lung but also affects function of Spleen.Spleen is the organ which produces energy and blood for human .So the syndrome of deficiency in the spleen is often manifested by cold limbs .disuria ,sleepiness, and slow and weak pulse,etc.
Therefore Chinese treatment is to warm and reinforce the spleen combined with excreting dampness. That can be treated through acupuncture & herbs.