1. Sleep inducing
   - soporific, soporiferous, somnific, hypnogogic, hypnagogic

See also: depressant

• upswept
• upswing
• upsy-daisy
• uptake
• upthrow
• upthrust
• uptick
• uptight
• uptil
• uptime
• Upton Beall Sinclair
• Upton Sinclair
• uptown
• uptrend
• upturn
• upturned
• Upupa
• Upupa epops
• Upupidae
• upward
• upwardly
• upwardly mobile
• upwards
• upwelling
• upwind