Sleep study on 2yr old?

I know this is a weird question, but has anyone had a sleep test done on their kids? I’m thinking about getting one for my daughter. She will be 2.5 in January, and still doesn’t sleep through the night most times, and when she does she’s tossing and turning all night. It’s not light tossing and turning either. It’s very rough, and it literally happens like every 5 seconds. Last night she was up from 1-4am. This has happened so many time before it’s starting to take a toll on me. I’m lucky to get 4 solid hours of sleep at night. It’s been like since she was a baby. I thought it was a phase, but now it’s starting to concern me. She also does a lot of heavy breathing while she sleeps. I refuse to be one of those parents that give my kid medication to sleep, but any advice is welcome here. I’m willing to try almost anything.