After the holidays, kids (and adults) are still wound up and full of post-festivity energy. For those who overstimulate easily, vibration is a fundamental component for sensory integration and can be incredibly useful in relaxation. Below are links to a few companies selling a variety of vibrating pillows and stuffed animals – Squeeze them, sit on them, lay on them, whatever works best!
http://www.specialneedstoys.com/usa/proprioception/vibration/
https://www.amazon.com/FlagHouse-3466AMZ-Vibrating-Pillow/dp/B009QV0LG2
https://senseez.com/about-senseez.asp