Working nights is bad for your health, that's a fact and there have been plenty studies done if you look for them. Whether LH is better than SH is totally subjective and I'd reccomend at least trying it. I've done BA SH for 5 years and really enjoyed it. Moved onto the triple a year ago and while the flying is more about systems management its good to experience the other side of the operation. Might move back to SH when my freeze is up or I might not but that's the beauty of working for a big firm, you can move to a job that suits your circumstances. Whatever you decide make the most of it.