I went of a cruise and my husband and I had one of the interior rooms, with no windows. It was near pitch black with the lights off. It was so odd to wake up and wonder if it was 2am or perhaps 7am or even 10am. Some people turned the TV on to the live feed from the bow of the ship so when then the sun rose the TV would light up.
It was fine for 2 weeks on holiday. But it would be murder as a student.