Does anyone here use one?

I have an appt with a child psych etc for Beth in 2 weeks. I called in desperation on Friday because after making good progress over the last month or so, we are going backwards again and the sleeplessness/night terrors are on a new level .

She suggested maybe using a weighted blanket to help her feel centred and grounded when she is horizontal, so I was going to make one and use lavender and rice for the weight.

Would that be ok? On some website it said you shouldn't use rice but I can't see why...