It will make you angry and frustrated, if that’s what you’re looking for. Probably doesn’t help with learning at all, quite the contrary. If you’re interested and engaged with the material, you can learn so much faster. If you hate what you’re doing, there will be very little progress, if any. Take a nap, and look at the material with fresh eyes when you feel better.

There can also be something I call “mental inertia”. Occasionally, it’s difficult to get started. That’s when a short warmup can help. Start with something easy, to get in the right mood. After that, you can tackle some of the harder problems.