We keep suggesting to clients who are in a hurry to make business decisions that if it's important enough, sleep on it.

Here's some recent research which seems to agree with what we know intuitively.

There are also interesting stories on the importance of sleep for learning and the possibility of unconscious learning - something we already use in our training.

I suppose if you take all of this together, it's possible that the people who doze through boring training courses still learn as much!