What is the purpose of sensory adaptation

Sensory adaptation is a phenomenon in which sensory neurons change their level of sensitivity to a constant stimulus over time. This adaptation allows people to adapt to their environments while balancing the need to receive new sensory input. Neurons involved with smell, hearing, taste, touch, and sight can all exhibit this phenomenon.

Sensory adaptation is when the sensory receptors change and adapt to different stimuli. For example in a darkened room your pupils enlarge allowing more of the available light in. This is why you can see a little better in the dark after you get used to it.