Crew cabins do not have windows unless you are someone special (management or officers, mostly). Living inside a tiny, closed-off room with only a florescent light inside can really start to drain you, especially since many job positions on board make it difficult to see the sun for days on end.
Once upon a time, on my first contract (I guess I have more stories from that one), the design of the ship meant that in order to get backstage in the theatre without crossing the stage itself (like when the lounge was open prior to a show) you had to go outside around the front of the ship on something like Deck 9. Although I was typically in a hurry at these times, I often tried to stop for a few moments and just breathe in the fresh air. Sometimes, all the techs would gather out there on a random afternoon and stand like cats in a patch of sun, soaking it up. I often used this area as a place of stress relief too, laying down on the deck for five minutes at night to stare at the stars before returning to the job ahead.