Inspired by Thomas Edison, and Salvador Dalí who both allegedly claim that one will wake up at the most opportune moment for creativity if they nap while holding something, a team of French researchers showed over 100 participants math problems.Those who couldn't solve the problem were asked to t...

The researchers found that after people spent at least 15 sec in sleep onset, their chances of figuring out the hidden trick to solving the math problem tripled.

Sleep onset / stage 1 sleep is a stage when you're drifting into slumber, when we're not quite asleep but also not quite awake.