alt Hacker NewsThe idea of a beach closing at night-time was novel to me, when I first came to the US. In the UK beaches are ... just beaches, their status is that of "beach", and access is not controlled at all.
Generally there's a fine for being caught sleeping on the beach I think, but that's really to discourage people being swept away.
With a few exceptions for snooty uptight municipalities who've written rules far beyond the norm you're generally allowed on the beach 24/7 on the east cost and access is likewise uncontrolled (except New Jersey). I can't speak to the west coast.