I always used to procrastinate too much so would start at 7, or 8pm then finish at midnight or then just do the almost opposite of doing barely any in the night to panic wake at 5am to squeeze as much as I could into a few hours before I had to go. I found then I really did what I could to do it as quickly as possible and as much as possible without being too concerned to get it perfect then. But I don't recommend either method.