Do snakes sleep in the day?

Snakes do have circadian rhythms, and many snakes are active only at particular times of day. Racers (Coluber), hog-nosed snakes (Heterodon), patch-nosed snakes (Salvadora), and sipos (Chironius) are strictly diurnal, whereas aptly-named nightsnakes (Hypsiglena), broad-headed snakes (Hoplocephalus), and kraits (Bungarus) are strictly nocturnal. read more

A snake in this position may be waiting for prey, ready to ambush, envenomate or strike, and it will be fully aware of its surrounding. During this time, the snake will not sleep but will be completely attentive. The eyes of the snakes do not have eyelids and they are covered by clear scales in the wild and in captivity. read more