Lycra Bed Sheets can be helpful, similar to weighted products, by providing deep pressure while laying down to help the over stimulated nervous system to 'calm down' ready for sleep, or to provide the environment for the child to gain the sensory input that they are craving through resistance as the child crawls underneath, stretching the bed sheet with their body, arms and legs in all different directions.
Sensory Matters Lycra Bed Sheets are unique as the bottom section is not closed off, so the child can use it like a tunnel too - crawling through from one end to the other.