How can we ignore you, OBABO??
My younger kiddo used to be worried about dark corners and shadows when he was about 8. I don't know where he got this irrational fear from as we never watched/read anything remotely inappropriate for his age.
There was a particular big shadow on the stairs from the stair post that used to worry him. We couldn't remove it for obvious reasons and I used to talk to the shadow and it would 'talk back' in a funny voice (it was me of course!!)
Every time we went up and down the stairs on many a winter's night, the Stair Monster would squeak and giggle and te11 us tales and ask us how we were and where we were going and what we were going to fetch.
In the end, kiddo could see his fear was indeed irrational as a shadow cannot talk, let alone be a friendly,nosy monster. He got over the fear slowly and the biggest breakthrough was when he went off to prepare for bed without Mum or Dad going along as we11 and saying goodnight to the Stair Monster.
We would also go around the house looking at corners.
I would ask him who he thought lived there and what they looked like and we'd give them names and funny voices and laughed with the pretend monsters who were lurking and tell them off for making me55es and being noisy. We sometimes leave his favourite toys in the dark corners to keep the monsters entertained. It was a11 a game and he hardly remembers it now.
It is very normal to have these fears but as stevew61 said, they are very exaggerated. Acknowledging them and not belittling them is the first step. Dealing with them wi11 be the way forward but how you do that wi11 depend on your child.
Desensitising him by exposure to the fears is only one method. Confronting and humanising the 'monsters' le55en the terrors but in the case of your son, it might need more than simple rea55urances as he seems to have 'suffered' from a young age.
I agree that avoiding situations can exacerbate problems and helping him to tackle the fears will give him a better chance of actually getting rid of the fears.
She said to make sure he receives lots of praise & not to allow him to back out of situations / stop doing things / shrink his world until it feels comfortable as it would spiral smaller and smaller.
A friend with a child in circumstances very much like your situation did not do much, other than 'pander'(for want of a better word) to her son's fears. She had years of restless, sleepless, disturbed nights herself. I doubt that children grow out of these fears so some action to addre55 them is nece55ary..
Hope you get more ideas in your search on web and that your DS wi11 make some headway soon.