1) Less alert 2) Less awake 3) Less bustling 4) Less lively 5) More beat 6) More droopy-eyed 7) More drowsy 8) More heavy-eyed 9) More inclined to drop off 10) More likely to crash 11) More somnolent 12) Really ready to retire Found on https://www.crosswordclues.com/clue/sleepier
1) Less alert 2) Less awake 3) Less bustling 4) Less lively 5) More beat 6) More droopy-eyed 7) More drowsy 8) More heavy-eyed 9) More inclined to drop off 10) More likely to crash 11) More somnolent 12) Really ready to retire