1. Sleep inducing
   - soporific, somniferous, somnific, hypnogogic, hypnagogic 
2. Inducing mental lethargy
   - narcotic, soporific

See also: depressant, uninteresting

• assault and battery
• assault course
• assault gun
• assault rifle
• assaulter
• assaultive
• assay
• assay-mark
• assayer
• asse
• assegai
• assemblage
• assemble
• assembler
• Assemblies of God
• assembling
• assembly
• assembly hall
• assembly language
• assembly line
• assembly plant
• assembly program
• assemblyman
• assemblywoman
• assent