You know that feeling when you wake up having had a few drinks the night before and feel surprisingly fresh? There's a feeling of bullet-dodging relief tinged with a sense that eventually that hangover is going to catch up with you. You might get away with it all day and get lucky, or you may crash some time after lunch.

Arsenal this season are in the middle of something similar. On paper, everything looks pretty rosy at the Emirates, with Unai Emery's side reeling off seven straight wins - including five in the Premier League that have hoisted them from 17th up to fifth.

It would be churlish to complain after such a run, especially so early in Emery's reign and considering that Arsene Wenger's Arsenal were frequently accused of being incapable of digging out wins. Goalkeeper Petr Cech even alluded to this last week.

But Emery will be acutely aware that all of this season's league victories have been achieved with flawed performances that on another day could easily have seen Arsenal dropped points.

Take Saturday's 2-0 home victory against Watford which was achieved in spite of the visitors creating six big chances (their most in any game this season) to Arsenal's three and having a far higher expected goals (xG) tally of 2.76 to Arsenal's 1.39. Even taking into account Craig Cathcart's own goal that is not included on xG, Arsenal lagged comfortably behind.