Even good habits take effort, so make sure the ones you've committed to aren't actually doing more harm than they're worth.

From biology to economics, scientists are discovering that sloth may be fundamental to our makeup. Settle a little deeper into your couch and learn why.

Are you a morning person or a night person? It might not matter. Discover how science says you should structure your day for the best results.

Why fill your public transit commute (or drive) with mindless chatter when you can use that time to smarten up, instead?

Are you sick of work...or is work making you sick? Try some simple home office changes that can help you feel better — and be more productive.

Do you lose your energy and glow every afternoon? Or do you have trouble getting to sleep at night? Your problem could be your lights.

Feeling off kilter? Out of whack? A step behind? Try these balancing tricks refocus on the things that really matter.

Fail to reach another goal? Don't beat yourself up about it (that's reason #6), but do use this list to learn why you've failed — and how to do better next time.

Whatever time management and productivity tools and tricks you try, if you don't master this, you won't control your time or your to-do list.