A person who likes staying in the dark or prefers darkness over light is often referred to as a "nyctophile" or a "noctophile." The term "nyctophile" comes from the Greek words "nyx" (night) and "philia" (love), indicating a love or affinity for the night or darkness. It's worth noting that some people may enjoy darkness due to its calming or introspective qualities, while others may simply find comfort or solace in dimly lit environments.