A lot of problems can be rephrased as an equivalent problem with a known solution. If you're completely stumped, take a break. Go for a walk / bike ride / what

A lot of problems can be rephrased as an equivalent problem with a known solution. If you're completely stumped, take a break. Go for a walk / bike ride / whatever. The context change can help you see approaches you've overlooked. Get enough sleep, or you'll be too tired to realize you're not thinking clearly.