That produces sleepiness or forgetfulness, Lethean

http://lila-erc.eu/data/lexicalResources/LewisShort/id/LexicalSense/n26336.5 an entity of type: LexicalSense

That produces sleepiness or forgetfulness, Lethean 
That produces sleepiness or forgetfulness, Lethean 

data from the linked data cloud