I learnt a new word yesterday: akrasia (rhymes with "aphasia" and "Malaysia"). It means not doing the things you want to do and know that you want to do; acting against your better judgement. The classic example of akratic behaviour is weight loss (or weight control). That extra slice of pie always looks like such a good idea at the time and there's no short-term consequence. It's only later that you look back with a queasy feeling of regret at the empty pie dish and think of how your rolls of kidney flab are just not fashionable any more (and probably haven't been since the 1830s).
Everyone is akratic to some extent. I know that I am. Some days I just can't face the work I have to do (even though it's usually fun once I get started) and just doodle around on the internet. I've tried various methods for organising myself (I use org-mode in Emacs for pretty much everything: TODO lists, scheduling, time tracking for invoicing), I've tried structured procrastination. Sometimes these things work and sometimes they don't. The main problem is that, while these methods can help you to organise yourself, they don't impose any short-term consequences on you to make you do things.