Were early homo sapiens able to see the infrared spectrum at night?

No primate can see infrared at any time. There are very few creatures that can see infrared as it cannot be focused with a biological produced lens (due to the water that will be present, which absorbs infrared), so a type of eye based on the pinhole camera must be used by these few creatures.

The only creatures that I am aware of that can see infrared are the snakes known as pit vipers. They are called pit vipers because their pair of infrared "eyes" look like tiny pits in their face.