Here's (the first half of) a psalm which reminds me that all my frantic worry and busy labour can't achieve a thing without God. He is the one who "builds the house", not me.
Knowing that, I can sleep peacefully. I can rest.
Unless the LORD builds the house,
the builders labour in vain.
Unless the LORD watches over the city,
the guards stand watch in vain.
In vain you rise early
and stay up late, toiling for food to eat—
for he grants sleep to those he loves.