The morbidity of sleepiness and the mother’s risk of suffering an accident as a result of sleepiness should be weighed against the foetus’ possible risk of problems as a result of exposure to intrauterine stimulants. In practice, the advice (Pic. 1) given to women with narcolepsy and idiopathic hypersomnolence (excessive daytime sleepiness or prolonged nighttime sleep with unknown origin) is to discontinue stimulant therapy during pregnancy because of fear of potential teratogenicity. Some patients chose to remain on stimulant therapy during their pregnancy because of intolerable sleepiness. There is a lack of documentation on how women cope with their symptoms during pregnancy, and in practice, doctors find it quite difficult to advise these patients.