It’s quite productive, actually, according to new studies:
When your brain is tired, you take in distractions that you would normally ignore because your mind is too drowsy and disorganized to fight the invasion. Your tired brain struggles to focus on one thing at a time, so you wander, gather loads of irrelevant information, and connect those random pieces together, which can result in offbeat solutions or innovative products and ideas.
From OPEN Forum’s “Why Being Bored and Tired Can Improve Your Creativity”
You may be surprised to find how quickly daily routine and the demands of “just getting by” absorb your waking hours. You may be surprised matters of habit rather than thought and inquiry. You may be surprised to find how quickly you start to see your life in terms of other people’s expectations rather than issues.
A lot of people view brainstorming in an additive way—we’re adding to the number of ideas. But that’s not the power of the group. The group’s power comes from the synergy that goes beyond the additive. What the most creative companies do is tell the members of the group to come up with lists of ideas before they come to the brainstorming session. What the group is really powerful for is exchanging ideas and then having ideas bump up against one another and merge in surprising new ways that any one person might not have thought of on their own.