Lots of people are commuting, but take a look at the traintables if it is your plan to go by public transport. As i can see you would have aproblem with the lates when comming back just around midnight, as the trains (as i know of) do not go from the airport after midnight. And the same with the early mornings when you have to be in the office 1 hour before the devil gets out of bed.
But if you go by own car the odd times maybe beneficial for you, as you will often avoid the peak hours on the M11 and M25 parkingroads
