Melatonin can cause somnolence (drowsiness), and, therefore, caution should be shown when driving, operating machinery, etc.
en.wikipedia.org When seizures are controlled by a medication, many anticonvulsants have side effects that include drowsiness, thereby also impacting a child's education.
en.wikipedia.org Short term exposure to glycol fog can be associated with headaches, dizziness, drowsiness and tiredness.
en.wikipedia.org Adverse effects may include hangover type effects, drowsiness, behavioural impairments and short-term memory impairments.
en.wikipedia.org A tea made from the leaves was taken as a laxative and strong diuretic as well as for jaundice, dropsy, and enteritis with drowsiness.
en.wikipedia.org