The answer is obvious. In outer space there is no day/night cycle so, being nocturnal, the lobster is continually stressed not having an active period.
the flying possum is nocturnal
nocturnal
They Are Strictly Nocturnal
Nocturnal flying insects.
they are nocturnal
Flying mammals, often nocturnal.
The Nocturnal mouse like flying animals that people mite see in their home from time to time are called bats .
Mainly flying insects, which are caught in flight.
Only flying squirrels are nocturnal. All other types of squirrels are active during the early morning and early afternoon, this type of behavior is called crepuscular (as opposed to diurnal = active mostly during the day, and nocturnal= active mostly at night )
nocturnal
BAT
a bat