I've never taken MSM, so I have no idea there. But the dream stuff? Absolutely. Truly disgusting, immoral, amoral and/or just plain scary dreams often preceded visible physical symptoms of accelerated detox, such as bromide zits, brown/orange/chartreuse urine.
Thankfully, memory is selective and I no longer remember those dreams:)
I've always taken Iodine
2x per day, morning & evening & never really thought about changing the timing to avoid the dreams. That phase passes.