On course you will be night diving twice a week and depending on when it gets dark, depends on when you finish... may not be till gone 23:00 hrs.
Revising with course members is important, there is a lot to learn and adhoc evening revision sessions organised by course members is a must. Just sitting round at the evening meal table ditting about the day's experience can be a boost to learning.
Getting up early and eating an Olympic sized breakfast is vital, on course you will be jamming upwards of 5-600 calories a day, Lunch is at 1400 at Horsea unless night diving, (1200), so if you haven't fuelled up at breakfast, you'll be hanging by midday.
My advice, even if you are given the choice of living at home, would most certainly be to live onboard.