The curling of your philodendron leaves can be caused by either too much humidity in the room that the plant is in or the philodendron leaves could be curling because of over watering or not getting enough water.
Make sure the philodendron plant is getting enough water and not getting too much water and provide plenty of sunlight for the philodendron plant.
If the philodendron plant doesn't get enough water or sunlight or even some artificial light then the leaves on the philodendron can start to curl.
Usually you can fix the problem with the curling leaves by making sure it gets enough water and sunlight and make sure you're not over watering it.
Then the philodendron should come back to life.