Another theory about children with autism and sleep is that there is not enough of the hormone melatonin produced in the body which alerts the body when it is time to sleep and time to wake during a 24 hour cycle. In addition to weighted blankets, a supplement of melatonin can be used after discussing the pros and cons with your pediatrician. You can learn the ins and outs of using the melatonin, and contraindications and correct dosing information for your child. It is fairly cheap and effective for most that use it.