Sanguine Leverkusen now 34 games unbeaten in all competitions, entering rare territory. Since the advent of European competition, Benfica hold this particular record, going undefeated in 48 matches between December 1963 and February 1965. Six other sides have reached 40 games without defeat in all competitions, most recently Real Madrid in 2016-17.
32 games was the record for the Bundesliga, so every game now extends their own record. They have essentially gone a whole season without defeat now.
Looking at their fixtures, the only real test left for them is a trip to Dortmund in 6 games time - could easily see them going the whole campaign undefeated - unless they fully take their foot off once they are Champions.