I am very concerned about my 11 month old grandson. He still wakes up 4 or 5 times during the night. I researched sleep problems because I have a 29 yr old w/ aspergers, also a 32 yr old w/rheumatoid arthritis. Both of these conditions involve low vitamin D/ melatonin involvement...autism involves sleep issues. I am now worried about the ramifications of sleep deprivation on the developing brain. The kid is a basket case in the afternoon. ...parents don't want to teach him proper sleep hygiene...he might cry. Will sleep deprivation compromise his brain development ?