Weighted blankets have long been used therapeutically for people with sensory sensitivity or restless leg syndrome, as well as to increase focus (particularly in classroom settings). Newer studies are finding that these heavy blankets increase serotonin and melatonin levels while also lowering cortisol levels. Your mood improves, and because the weight minimizes movement during sleep, it helps your body stay in a deeper sleep for longer.
I have several family members who struggle with sleep and/or anxiety, so weighted blankets sounded like an amazing solution. I was sold--but yikes! This blanket carries a price tag of nearly $300. I set out to make my own with a budget of $50, using plastic pellets for the weight.