I'm not as focused at work because I know I have some holidays coming up.
I've started to get a little too relaxed at work because I know the long weekend is just around the corner.
どちらも「連休前で気が緩んでいる。」というニュアンスです。
1) I'm not as focused at work because I know I have some holidays coming up.
I'm not as focused at work で「職場で(いつもほど)集中していない」
「連休が近い」は I have some holidays coming up. と言えます。
2) I've started to get a little too relaxed at work because I know the long weekend is just around the corner.
I've started to get a little too relaxed at work で「職場で気が緩み始めた」
「連休が近い」は the long weekend is just around the corner. とも言えると思います。
ご参考になれば幸いです!