Atlanta, Georgia (CNN)You know the feeling -- groggy and tired, not fully awake, not fully aware. We all get this way now and then when we're sleep deprived but for Danielle Hulshizer, it's a constant way of life.
Hulshizer suffers from idiopathic hypersomnia -- a sleep disorder where the feeling of sleepiness never wears off, even after sleeping all night and taking long naps during the day. It has interfered with her education, career, relationships -- her entire life.
"If I had a nickel for every time somebody (would) come up to me and go, 'oh you should go home and sleep -- you look so tired,' I swear I'd be a billionaire right now," says Hulshizer.
Sleep isn't restful for Hulshizer: "You don't wake up feeling energized and ready to go," she says, "you wake up feeling just as tired as you did 12 hours before when you laid down to go to sleep in the first place."
'Rock bottom'