I dont know what to do

My 6 yr old has been up all night crying ans saying there is colored bugs everywhere. Hes literally shaking and crying about it... Its now 6 am and hes still awake crying. Hes been up since 12.

I dont know what to do to help him or why he's "seeing" bugs that arent there. This is the first time its ever happened.

-He has Autism/ADHD.