Can you run out of oxygen in a house?

Well, not quite—recall that only 20% our air is actually oxygen; the rest is nitrogen and other gases. Still, the remaining 1,800 cubic feet of pure O2 is enough to sustain you for about 95 days. The real problem with a sealed room isnt running out of oxygen, its the buildup of carbon dioxide.

Are you allowed to sleep on the beach in Hawaii?

You cannot sleep directly on the beach anywhere in Hawaii. With a permit you can sleep right next to the beach on a designated campground. While you may be able to get away with sleeping on the beach, you are just as likely to be told to leave by the police or ground officials.