Some nudibranchs are out and about in the daytime, others do their exploring at night — many follow their internal clocks so they move more in one part of the day than the other, depending on the species!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Baby Orcas grow about half an inch every day during their first year of life!
Behavior & Intelligence
Cone snails are night hunters, which means they’re most active at night when their prey is sleeping!
Fun and Unique Facts
Each Great White Shark has unique markings on its dorsal fin, like a fingerprint, helping scientists identify individual sharks!
One of the largest nudibranch, the Spanish Dancer (Hexabranchus sanguineus), can grow up to 40 centimeters long — bigger than a ruler!