Arsenal manager Mikel Arteta said his side's Jekyll and Hyde display in Sunday's 3-3 Premier League draw at West Ham United was enough to give him nightmares.
The Spaniard looked aghast on the touchline as a dominant West Ham punished his lacklustre team by scoring three times in the opening 32 minutes with goals by Jesse Lingard, Jarrod Bowen and Tomas Soucek.