[ksk]

Do you have any goals that you've set for yourself? I've found that having specific goals with specific actionable and measurable items in them, helps with my procrastination.

Everyone is different, but sometimes external pressure keeps me on my toes. If I feel laziness setting in, I pre-emptively make a promise to someone that I'm going to deliver X by Y date.

Another thing cuold be to meet often with your team and discuss how you guys are making progress. It can give you a sense of purpose when you discuss shared-goals with your teammates.

Or maybe your job has gotten to be too mundane and you might benefit from switching jobs (although that can obviously backfire if your new job sucks worse :P).

Basically you need to just figure out what makes you tick and apply pressure accordingly. Nobody has a internal fountain of infinite intrinsic motivation. Everyone needs a nudge/push/shove every now and then.