Sometimes they do, so they can observe at night.
However, there's a lot more to the job than observing in "real time".
Also, there are astronomers who don't need it to be dark, for example radio astronomers.
daytime
nocturnal animals sleep at daytime and daytime animals sleep at nighttime or for short nocturnal animals are the opposite of humans!!
They didn't sleep in the day, they worked.
YOU CAN NOT SLEEP AT WORK!!You will get fired!!!
narcolepsy
yes
your grow while you sleep
Yes, cockroaches do sleep. The cockroaches have a specific time that they sleep and eat. Generally, they sleep during the daytime hours.
koalas sleep during the day they sleep for 16 hours a day
they sleep and eat all day
No Chinese hamsters sleep at daytime and play at night.
Excessive Daytime Sleepiness (EDS) or Narcolepsy