I think they are really enjoying! What’s the nam...

When the leaves point up like that it's called "praying". It's generally considered a sign of perfect lighting height height power. Good work!

It means your plant is happy. It's growing normal. If it was heat/light stress your leaves would look like a taco or the edges would curl/roll a little.

Hi I found only this: When the serrated edges of marijuana leaves curls or tipped up like that, it's often a sign of temperature stress, overwatering/root problems or extreme humidity levels. ... If this is happening to the plants which are closest to your grow light, that's a hint that the problem may be temperature related. But i wait with you on answer from more experienced grower. Wish You happy grow