"It was two solid weeks of night shoots and you get into a very strange headspace when you're doing that because you're getting home at 6, 7 in the morning when it's getting light and then you sleep all day. ... Humans aren't nocturnal creatures, so we all got very disorientated and quite emotional by the end, really," Kit told AccessHollywood.com . "I don't know whether it's the emotions of characters leaving the show and actors that you've worked with for a long time leaving, but it was quite -- I remember Richard [Madden, who played Robb Stark] talking about The Red Wedding and how kind of emotional he got during that, just because of the intensity of shooting that many scenes, that many night shoots and it was the same for us."
In Sunday's episode of "Game of Thrones," several characters exited the series including Jon Snow's love, the Wildling Ygritte, a character played to fullest by Scottish actress Rose Leslie.
The sequences for the battle at The Wall were shot in Belfast, Northern Ireland, and it left the cast and crew exhausted.
"Oh God, you have no idea," Kit said. "It was two solid weeks of night shoots and you get into a very strange headspace when you're doing that because you're getting home at 6, 7 in the morning when it's getting light and then you sleep all day. … Humans aren't nocturnal creatures, so we all got very disorientated and quite emotional by the end."
"That was pretty much my last scene that I filmed. It was also Rose's last scene, which was really nice 'cause we'd gone through a lot together in the series, and as characters and as actors, and so it was nice to say goodbye to her in that way -- that we got to share that last scene together," Kit said. "And very emotional. You grow very close to your fellow actors on a show like this where you're working so closely together and you become very, very good friends.
"It's a sort of really horrible moment saying goodbye to someone on the show, like Mark [Stanley] as well, who plays Grenn. I've worked so closely with him over the last four years that the fact that he's not going to be in next season is really horrible," Kit said.
Rose Leslie - Ygritte on the show - said the milestone represents the hard work of executive producers David Benioff and Dan Weiss.
"Wonderful," Rose told Access , reacting to the news. "It's so, so great. Oh, it's so wonderful and that is such an accolade to David and Dan."
"Game of Thrones" concludes its fourth season this Sunday night at 9 PM ET/PT on HBO.