Chronic fatigue syndrome: Myalgic encephalomyelitis, more commonly known as chronic fatigue syndrome or ME/CFS, is a sleep disorder that can cause those.
Grief: Grief, while usually not a chronic condition, can have serious, adverse effects on the body.
What can cause dysania: Dysania itself is not a diagnosis, but is a common symptom that can be caused by numerous other ailments and illnesses.
Fatigue: Fatigue, unlike sleep inertia, is a sense of intense tiredness that can last days, weeks, or even months.