Sim keeps jumping out of activities

I just downloaded the expansion pack Supernatural last night. I have a lovely new fairy sim with a small problem. She can't seem to keep doing any certain things for very long. She goes from a dead sleep to standing at least five times a night, several times while on the toilet or in the shower, and at least once while eating.

How do I stop my sim from jumping out of activities? I wasn't having this problem till Supernatural.