While most(?) would have known this word to be 「しゅうや」, there's another pronunciation~ Which is.. make a guess!
Meaning: 一晩中 (all night)
why is it all night? I know if you can read chinese characters, it's easy to know the meaning. But think of it as「夜」は「終わる」まで if you can't read chinese.
「夜も」+「すがら」 which means from start to end without break = all night.
You certainly need lots of energy and youth to do all that! HAHA.