If you have a snake plant that is falling over there are a few possible reasons. One possibility is that the plant is not getting enough light. Snake plants need bright indirect light in order to grow well. If your plant is not getting enough light it will start to lean towards the light source. Another possibility is that the plant is getting too much water. Snake plants like to be on the dry side so if you are watering your plant too often it could be causing the leaves to droop and the plant to lean over. Finally it is possible that the plant is not getting enough nutrients. If the soil is not nutrient-rich the plant will not be able to grow properly and could start to lean over. If you think your plant is not getting enough of something you can try feeding it with a fertilizer specifically designed for snake plants.