If it's late at night then you need something to keep you awake and focused. I stumbled across this on cmd.fm and then found it on soundcloud. When I need to stay awake and blast through some work and really make some progress, I go straight for a featurecast mix. The one below is relentless (in a good way).

https://soundcloud.com/featurecast/featurecast-keep-it-comin...