This is what managers (and spouses) are for. If it's important enough they'll chivvy you to get it done. If it's not important then.... Oooh! Look! A squirrel!

The real lesson children is, never, /ever/ become a manager. That way you'll get to do the interesting stuff, i.e. actually make stuff, while some other poor deadbeat worries about "productivity" and chasing you to do stuff. This may be the only good use case for outsourcing. :)