Hi Alibraun, Your hibiscus is under stress, with most likely cause being lack of sunlight and fresh air and the air in house being dry. I don't grow hibiscus indoors, but do know what makes them survive and thrive and indoors would require a duplication somewhat like outside conditions or changes to cultural methods to allow the plant to cope with so very not normal conditions. Other possibilities are likely as well, but it is difficult to exactly ID a problem without me asking many questions and wanting photos to verify suspicions. Perhaps it is a combination of what I have suggested and other factors, say spider mite, sour soil, overwatering, but again I am guessing. If I was a betting person, I'd go with initial suggestions.
Try the link below and see if any of the information is helpful.

http://www.hiddenvalleyhibiscus.com/care/yellowleaves.htm

Another link is:
http://www.exotic-hibiscus.com/care/winter.htm

Good luck, Brian Kerr.

Thanks Brian! It does seem to be a little happier since I showered it a few days ago. It has been a very long winter here...waiting to be able to put it outdoors for the summer!