54 Burning questions 6

Why do they call space the final frontier when we haven't even been to the bottom of the ocean?

They say you need eight hours of sleep every night but does that mean we need continuous eight hours of sleep or can you break it up in small counterparts? Like for example would it be healthy for me to fall asleep at four in the morning and wake up at 8 o'clock in the morning and then go through the rest of the day awake until 8 o'clock in the afternoon and go to sleep until midnight?