How do cold blooded animals like lizards and snakes stay warm?

They usually sit in the sun to warm up until their senses are on.Without warmth they probably dont go anywhere(opinion)

Cold blooded

Snakes are cold-blooded - they need to absorb heat from the sun to warm their bodies instead of heating from the inside as we do.

All reptiles are cold blooded

yes snakes are cold blooded reptiles.i.e why they hide under gruond during winter.