I read this week Adrian Reynolds little book on sleep - And so to bed. It is the right length and covers most of the ground (the only ommission I spotted was Elijah and may be a blast against the idea of psychopannychia). His book suggests that quite a few people suffer with lack of sleep (not my problem I have to confess) and the first thing to help them is to think of it in a biblical way. There is also practical advice here and an acknowledgement of the fact that sometimes there may be a medical problem. Very nicely written. Thanks ever so much Adrian.
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.