GloFish are a variety of brightly colored, genetically modified fish that have become popular in home aquariums. Many people wonder if these beautiful creatures need darkness to sleep, like other fish do. The answer is yes! Although GloFish are active during the day and able to rest without darkness, providing them with periods of total darkness will help ensure they get enough restful sleep. When kept in an enclosed environment such as an aquarium, it's important for GloFish owners to provide their pets with consistent periods of dark time so that they can enter into a deep sleep state at night. This helps keep them healthy by allowing the body to repair itself while resting and also reduces stress levels caused by light pollution or too much activity within their tank. To provide your pet GloFish with adequate sleeping conditions, switch off any artificial light sources near the tank before bedtime each night and cover it completely with something opaque like a towel or blanket so no external light enters the tank while your fish is sleeping.