Wikisimpsons - The Simpsons Wiki
Nappien, technical name Methasorbizone tartrate, is a drug that helps you to sleep.
According to the advert, it is better than Sleepia for two reasons, it doesn't cause foot-fattening or elbow stink.
Homer asked the family to lock him in the bedroom at night, instead of not taking the pills as he was filled with stress.
 Side effects
The side effects of Nappien are: