Hi Dizzy
Would you like to post a recent EAS so I can take a look please?
If LO has a cough and cold then he is going to find sleeping more difficult, the same as you or I would when we are poorly. You might need to ride that out until he is feeling better after his cold but there's no harm in looking at your EAS to see if anything can help. Do you think the reflux needs further medicating?
The thing with the light, I have done this once or twice with DS when I was utterly desperate, I wouldn't recommend it as a regular thing to do, I know I certainly wouldn't like someone putting the light on suddenly, I think in the circumstances it is the shock of the change that brings them out of that almost hypnotic crying, like they get carried away with it. Other things I have done when I felt I really couldn't get DS out of that focus of crying was to take him out of the room, again it surprised him out of his crying. Again I don't suggest this as a regular thing, I've done it when DS seemed utterly unable to stop crying even though I was holding and cuddling him.
hugs to you
x