I have been reading on posts and my travel guide book that Nairobi is not safe at night time. What time is night time? Does that mean right when the sun goes down, it's unsafe or more like late night? Because here in San Francisco, CA, I'd consider night time unsafe around 11 pm. I am just wondering because I don't want to be confined to my hotel room right when the sun goes down. Is it really that bad to be back in my hotel around 10 at night?