Has your child’s pediatrician given you anything to help your kiddo sleep?

My daughter wakes up at 3 am almost every night and usually goes back to sleep around 6 am. I’m getting so worn out over here. I’ve had people in other autism parenting groups tell me that her pediatrician might recommend a sleep study. Which sounds horrendous. But also I don’t even know if they could prescribe her anything since she’s 3 years old? I’ve tried melatonin with her and it doesn’t do anything. Anyone been through something similar with their toddler? Is there any light at the end of the tunnel?