Ditto the "stay in your room" comments. Unplug the internet and hide the cable, clear your desk, get a desk lamp, and pretend you're in the library. If your hall has a library or other quiet study area, that won't close, so you could go there. You might find you do better studying in your room at uni though, I find I do, simply because there are less distractions.
And yes, I think the opening hours listed at the moment are summer opening. Can't remember the normal ones though, because I never go there in the evening.