What plant do you have? Are the leaves discolored?
Generally speaking, one of the most common causes of limp leaves is a hydration issue. I recommend that you make a determination on whether you are possibly under or over-watering your plant. Touching the soil with your finger is the best indicator - if the soil is dry to the touch, you should water it. If the soil is really damp and soggy, you have over-watered it.
For watering guidelines, please review the information in the article below: