Over sleeping

I hope you have an answer for me....

My daughter has sensory processing disorder. She is starting to do well in school, not crying much anymore, is answering questions, etc.

By the time Wed. and Thurs. come around she seems "zombied" and by Friday, she falls asleep after school and doesn't wake up until the next morning. She is being very obedient at school but doesn't look happy even at home now.

Is this something that I should expect from her?