Where does “sesta” come from?

sesta (Portuguese) comes from Old Portuguese sesta, from Latin sexta, from Latin Sextus, from Latin sex, from Proto-Italic seks, from Proto-Indo-European swéḱs — six.

sesta (Portuguese): nap

Definitions

Ancestry of “sesta”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	sesta	—
2	Latin	sexta	Noon, reckoned as the sixth hour of daylight;...
3	Latin	Sextus	particularly popular in Gaul. (Occasionally also found as a cognomen.) In particular
4	Latin	sex	six; 6
5	Proto-Italic	seks	six
6	Proto-Indo-European	swéḱs	six

Every word from Proto-Indo-European swéḱs →Every word from Proto-Italic seks →Every word from Latin sex →