Methanol poisoning?
Signs/Symptoms
TIME COURSE: Adverse health effects from methanol poisoning may not become apparent until after an asymptomatic period of 1 to 72 hours.
EFFECTS OF SHORT-TERM (LESS THAN 8-HOURS) EXPOSURE: Methanol’s toxicity is due to its metabolic products. The by-products of methanol metabolism cause an accumulation of acid in the blood (metabolic acidosis), blindness, and death. Initial adverse health effects due to methanol poisoning include drowsiness, a reduced level of consciousness (CNS depression), confusion, headache, dizziness, and the inability to coordinate muscle movement (ataxia). Other adverse health effects may include nausea, vomiting (emesis), and heart and respiratory (cardiopulmonary) failure. Prognosis is poor in patient/victims with coma or seizure and severe metabolic acidosis (pH <7). Early on after methanol exposure, there may be a relative absence of adverse health effects. This does not imply insignificant toxicity. Methanol toxicity worsens as the degree of metabolic acidosis increases, and thus, becomes more severe as the time between exposure and treatment increases.
https://www.cdc.gov/niosh/ershdb/emergencyresponsecard_29750029.html