Best Answer: there are some species of spider and many male spiders that wander in search of food or female mate. as most spiders are nocturnal, they are most apt to be spotted at night. spiders, however are not blood suckers, and wont bite a human except in defense.ts amazing how many people think they get bit by spiders at night. Most bites at night are insect bites. Even doctors blame spiders for bites they see in patients, when they actually have no idea what bit the patient. Here are the many myths about spiders.