I was unable to connect to PS last night (oh, about 12 hours ago from now). Was there an interruption of service?
Not that we know of.
But it does happen sometimes that the server does not react for a while. This could be caused by some scheduled batch processes (backup, report creating, etc) which run at fixed times every night, or maybe the database decides to reorganize itself (they do that sometimes). Usually it's back up after a few minutes, and no need to worry unless it takes significantly longer than that.
I'll check the logs tonight though.