DS found that his work was set on a Friday, so weekends were working days last year. Tutorials on Thursdays and Fridays, so they were actually his weekends. Student Nights in clubs are Wednesdays and Thursdays.
So, no, he only came back home mid term on the couple of occasions when he was ill and needed a proper sleep.
Oh, and they pretty much sleep for the first week back home anyway, because the workload is so intense during term time.