Constant procrastination.
Never seem to have more than an hour's real free time a day and then I'm feeling so lazy that it's easier to watch tv or read.
Also, a frustrating feeling of perfectionism in that I want things I write to be witty, informative, engaging, amusing etc, and the pressure to write something to that standard kind of puts me off a little!
Daytimes are tricky cos of entertaining 9 month old ds but if we didn't have a tv I reckon I would write more in the evenings. Listen to me blaming everything else... I guess my reasons are mostly down to lack of self-discipline to be consistent. I need to be inspired