Initial symptoms of excessive sunlight include wilting or curling leaf edges and tips. Temperatures hotter than 75 °F (24 °C) can result in fewer leaves and long, spindly stems.
Prayer plants need moist soil to grow, but overwatering can lead to root rot,... Poor Soil Quality. Colder temperatures and dry air will cause the prayer plant's leaves to shrivel and turn brown.

Ideally, the plant requires five to six hours of indirect sunlight and consistent temperatures between 65 and 85 degrees Fahrenheit to thrive. Chlorosis.
Excessive sunlight causes the leaves of the prayer plant to wilt and dry up. The prayer plant thrives in light shade. Problems With a Prayer Plant Excessive Sunlight. This … Iron deficiency, technically known as chlorosis, can affect prayer plants grown in... Root Rot. Leaf spot, also known as helminthosporium leaf spot, is one of the most common diseases to afflict prayer plants. This disease can be deadly if not treated quickly.

As prayer plants are tropical plants, they do not thrive when temperatures dip too far below 70 °F (21 °C).