Portuguese sono

← Spanish sueño (cognate)

← French sommeil (cognate)

← Proto-Indo-European *swépnos (inherited)

← Proto-Indo-European *swopnos (mention)

← Proto-Indo-European *swep- (mention)

← Italian sonno (cognate)

← Latin somnus (inherited)

→ Spanish sueño (cognate)

→ Portuguese ensonado (confix)

→ Portuguese soneca (affix)