D.B.
You see a doctor to have his medical situation evaluated, and you work with someone qualified to look at the particular supplements you are giving and whether they even contain what the labels say they do (there were major news reports on places like GNC and Whole Foods that sold unregulated and bogus supplements). So I have no idea what "calming tablets" are - I work in food science and believe in quality supplements that are manufactured under the proper conditions and which carry patents, but I've taken a good friend to the hospital who messed up her blood pressure and heart rhythms by taking "all natural sleep aids."
If he "sees things" then you need to get to the bottom of that and see what his stress or anxiety levels are doing to him.
I can tell you now that he is totally sleep-deprived and that it has an effect on brain development and brain chemistry. Hard to say which is the chicken and which is the egg here, though.
I agree he shouldn't be in your bed. If that's helping him, then this sounds a lot like security and anxiety, perhaps on top of other things.