Look at it from the opposite direction; why spend time escaping from life instead of living it? Spend time learning to live life, exploring and finding what you enjoy instead of being dull and dazed, anxious, and asleep? Thinking about things is not the same as actually trying/doing them; you can "decide" all you want that you don't want to run marathons but you can't know for sure until you take up running and give it a good try. So, using your head to limit your life is not a very smart thing; use your head to help you figure out what to try next. I love the scene in "Runaway Bride" where Julia Roberts tries all the different egg dishes to figure out exactly how she likes her eggs If you haven't tried it, don't knock it.