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меньше знаешь – крепче спишь stresses
fig.	ignorance is a blessing (Mikhaill)
proverb	the fewer secrets you keep, the more soundly you sleep (VLZ_58); fewer secrets to keep will help you have a sound sleep (VLZ_58); ignorance is bliss (SirReal); what you don't know can't hurt you (SirReal)
saying.	curiosity killed the cat (moebiuspenguin); the less you know, the better you sleep (a widely-known Russian proverb Alex_Odeychuk)