A Novel Inhaled Formulation of Melatonin to Treat Adults With Insomnia: Pharmacokinetic Study

The goal of this clinical trial is to explore the potential benefits of an inhaled version of melatonin compared to oral melatonin tablets on adults with insomnia. The main question the trial aims to answer: is the time required for inhaled melatonin to reach peak concentration in the blood and then be eliminated from body different to that of oral melatonin tablets, in adults with insomnia? 5 participants will: * Visit the research institute for a screening visit and for a daytime visit to take a melatonin treatment then provide blood samples over the course of 8 hours for each study drug treatment (3 visits in total) * Take 100 μg of inhaled melatonin (2 inhaler puffs) once * Take a 4 mg of oral melatonin (2 tablets) once