My son is scared of monsters....Need advice

My son will be 3 in less than a month. He has had a hard time going to sleep at night I would say the last month. Tonight has been the worst it’s taken my husband and I over an hour to get him to sleep. Also he won’t sleep through the night too. We have put a nightlight in his room and we even got him that star belly bear for Christmas in hopes that it would help the whole “monster” thing. Im also about 6 weeks away from having my 2nd baby. Which I’m not sure if this has anything to do with the whole “monster” thing. Has any mommies had this happen with your little ones? How did they get over being scared of monsters?

Update: I did the Monster spray and it has worked wonders. Thank you to everyone that suggested the monster spray. We spray the window and closet door and under the bed and he is sleeping through the night.