Cf: The best advice is found on the pillow (Br.). Consult with your pillow (Br.). Have a sleep on it (Br.). Morning brings counsel (Am., Br.). Night brings counsel (Am.). The night brings (is the mother of) counsel (Br.). Sleep brings counsel (Br.). Sleep on it (Am.). Sleep over it (Am., Br.). Take counsel of your pillow (Br.). Things look brighter in the morning (Am.)
Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.