"Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it." - Sir Isaac Newton
Even if they don't put a name to it, everyone has an intuitive feel for the effect of inertia (which is pretty much just a lack of any other effect). If I set a bag down, i don't expect it to start moving for no reason. When I approach a stop light, I know it will take a little bit of distance to stop because the car wants to continue moving forward.
I see the same effect in myself when it comes to sleeping, and a lot of other things. If I'm awake, I want to stay that way. There's a reason people shell out good money to sell Real-Estate-Secret-System-To-Make-More-Money-Than-Buffett-For-No-Money-Down at 3 am in the morning. I am that reason. On the flip side, it takes the threat of impending job loss and homelessness to get me out of bed in the morning. It takes every ounce of willpower to get out of that same bed I was avoiding just 6 short hours earlier..
The effect seems to be the same in a lot of ways. House/yard/career work, exercise, healthy eating, etc. I'm pretty good at maintaining them, but getting started is a bear.
I guess the million dollar question is - how do I/we overcome it?