There is a condition called chronic fatigue syndrome in which people have long-term fatigue in a way that limits daily activity.
I think it's called Chronic Fatigue Syndrom, or CFS.  I don't know a lot about it, but it makes people tired for long-term amounts of time.
I have quite a lot of energy, but I know some people just aren't as lucky. Is their a medical condition for being constantly tired?
Chronic fatigue syndrome (CFS), also referred to as myalgic encephalomyelitis (ME), is a medical condition characterized by long-term fatigue and other symptoms that limit a person's ability to carry out ordinary daily activities.