Earlier quoted context omitted.
I think it's actually more causal than you first give it credit for. I think creativity cultures a certain laziness for that person. From observing my friends and I, my anecdata suggests that the most creative are on average more lazy because they can use their creativity as a clutch to make up for a relative lack of hard work. The other intelligent but less creative individuals must suppliment that with grinding awa…
Hard work can also just be mentally exhausting, and it's much easier to just wait for a proper creative mood than to struggle for who-knows-how-long trying to do something you know you can easily do with far less effort at a later time.
http://www.brainpickings.org/2013/04/23/daily-rituals-mason-...
It's about great people and how they structured their days. What seems to be fairly consistent was that they were often 'on and off' as well, but to try to ensure that they did actually get work done consistently was to work a) every day and b) not for too long. So each day wasn't a slog like the usual 9 to 5 treadmill, but each day gave them enough space to get some of their best work done and have enough rest to be able to do it every day of the week, every day of the year.