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That's a real thing, and yes, they do. They're called weighted blankets and my wife has one. They're clinically shown to help with anxiety.

Perhaps a "sand vest" or "hug vest"?

Look up gravity blankets.

Also called "weighted blankets".

The rule of thumb for optimum blanket weight is 10% of body weight + 1lb.

Would probably weigh more than your entire bed :)

Probably! On the plus side you'll be shielded from radiation while you sleep!

But you might be exposed to lead...