Mine do that all the time, cabbage, devils hand, finger, etc. Sometimes if you have a light on in the same room or a light in the sump on at night, it will turn and reach in that direction. Then when the tank lights go on they turn back to the upright position to reach for the strongest light. Leathers in general have a down cycle at night, and a period where they stay closed until they shed their top layer then open new again like a butterfly. Hope that helps.