You've been stuck on a thorny problem for an hour, and the forehead-shaped dents on your desk are going to upset the maintenance department--again. You're about to run out of coffee. The problem is attached to you like a squid on the Nautilus. What's the next step?
Science says the next step is, literally, steps. Take a break and walk. Eyes off screen, don't read your phone. Go outside if you can. The "extra" ten minutes will often save another hour of struggle as you give your brain a chance to do what it's good at: reforming patterns.
Try it today. Stop. Breathe. Take a walk.