C.H.
Hi L.,
I agree that it is probably a tactic to get out of bed or to get more time with you. However, I have a degree in speech and hearing sciences. There was an entire article that I read called "Phonophobia in the 4 year old." Basically saying that around 4, noises (particularly loud noises) upset kids.
It could be attention seeking, but it could also be a normal phase. I have given my kids limits to the number of times that they can come out for bathroom or drinks, etc. They have consequences if it is more than that. I would just reassure that you are there and that you will always take care of him and that he is safe. That's really all you can do without being conned. :)
C.