Although night is the most common time for bed bugs to come out, it is not the only time. They are not truly nocturnal. Bed bugs will come out during the day. In fact, they come out whenever they think they will find a meal, so you can't count on not getting bitten during day time hours.
It is not necessary for bed bugs to feed every day or every week. They can "lay in wait" for the next host for surprisingly long periods of time. In fact, under certain conditions, research indicates that bed bugs can survive up to periods of about one year without feeding.
Other Reasons Bed Bugs Are Seen During the Day: Bed bugs will often change their normal nocturnal behavior and feed during the day if the resident(s) work at night and sleep during the daytime. When a bed bug infestation is very large. Another situation that may cause activity in a lit environment is when bat bugs,
Compared with other insects, bedbugs are slow to reproduce: Each adult female produces about one egg per day; a common housefly lays 500 eggs over three to four days.
However, it doesn't mean that bed bugs don't feed during the day. In fact, the feeding behavior of these nuisance pests is quite unpredictable. Long story short, bed bugs feed whenever they are hungry and if there is an accessible host lying perfectly still on the bed. Adult bed bugs feed only once a week.
Bed bugs feed come out to feed during the day as much as they like to feed in the night. Like every other nocturnal critter, it is the fear of being spotted and possibly killed that keep these critters in during the night.