Ecclesiastes 5:12

5:12 The sleep of the laborer is pleasant – whether he eats little or much –

but the wealth of the rich will not allow him to sleep.

Ecclesiastes 8:16

Limitations of Human Wisdom

8:16 When I tried to gain wisdom

and to observe the activity on earth –

even though it prevents anyone from sleeping day or night –

Ecclesiastes 4:11

4:11 Furthermore, if two lie down together, they can keep each other warm,

but how can one person keep warm by himself?

Ecclesiastes 10:20

10:20 Do not curse a king even in your thoughts,

and do not curse the rich while in your bedroom;

for a bird might report what you are thinking,

or some winged creature might repeat your words.