adj. 25B6; adjective
the tablet made her drowsy : SLEEPY, dozy, heavy-eyed, groggy, somnolent; tired, weary, fatigued, exhausted, yawning, nodding; lethargic, sluggish, torpid, listless, languid; informal snoozy, dopey, yawny, dead beat, all in, dog-tired; Brit. informal knackered.
a drowsy afternoon : SOPORIFIC, sleep-inducing, sleepy, somniferous; narcotic, sedative, tranquillizing; lulling, soothing.
alert, invigorating.