While that may be, generally speaking, a plant in heat distress will curl it's leaves upwards, in an attempt to minimize the leaf surface exposed to the light. The serrated edges of the leaf start to curl up first, then the tip will start to curl and the entire leaf edge will start to lose color slowly until it turns brown and crispy. Drooping leaves can indicate several things, but with no pics, the most common reason is over watering.lights might be too close