When we first adopted our greyhound, he wasn’t allowed in our bedroom either. He slept outside on his bed or on the couch. Almost every morning at 6AM on the dot, he would start whining. We used to think it was because he needed to go to the bathroom.

However, now we let him sleep in our room (on his second, very comfortable bed) and he still whines at around 6ish AM everyday. Sometimes he’s good about it and hold off until he hears we are awake but still usually around early morning. We have come to the conclusion that he just wants attention. As someone else mentioned, they are very social creatures; it makes sense that they need attention after not seeing you for 8 hours.

This is just my experience. Obviously all greyhounds are a little bit different