I've warned people about them, before, but those treasure chests can bring misfortune just as easily as fortune. For example, you may find out that a Uniclops has captured all your animals and won't return them until you've generated some large amount of energy. Now, a challenge with an eight-hour time limit can be fun, but this is not what you want to hear right before you go to bed. (You know, for the next eight hours.)
I guess the moral of my story is this:
If you use the treasure chests, use them early in the day
and when you can do some exercise if need be.
