drowsy

adjective
  1. Feeling sleepy and lethargic; inclined to sleep. adjective
    After the long meeting, she felt drowsy and needed a nap.
    The warm sun made him feel drowsy as he lay on the beach.
  2. Inducing sleepiness or lethargy. adjective
    The drowsy effect of the medication made it difficult for him to concentrate.
    The drowsy hum of the car engine lulled the passengers to sleep.