Wall Of Sleep

The caster projects a wall of shimmering purple force in front of them and any friendly creatures behind them. The wall stays in place, as long as the caster maintains concentration, or until the wall is dispelled. Any enemy target creature with 100 ft of the wall or who makes contact with the wall , instantly falls asleep for 8D8(+ the  Caster Casting Ability Bonus ) rounds. 

Example :- A wizard with an Intellect score of 20 , causes the sleep effect of the wall , for 8D8 + 6 rounds.