obstructive sleep apnea/hypopnea syndrome
"Nuvigil was a blessing when I started it 18 months ago.  I was alert and focused, not depressed, AND retained my creativity!  I think I've become dependent upon it since I feel awful without it.  This week the doctor wants me to try going to 250mg since I've been a bit down with shorter days and less focused.  Due to cardiac conditions, amphetamines are not really a safe option.  All said, at age 51, it's been pretty much a wonder drug treating multiple conditions."