Sleep disturbed every 30-60 minutes like clockwork?

[Bluetaelon]

We have the Charge HR. I've had my 9yo with behavorial issues wearing the fitbit the past 2 weeks to see whats going on with her sleep as I know she's a very restless sleeper. On average her sleep is disturbed 30-40+ times a night and time to fall asleep is 0. I know she's out in 2-3 minutes every night, she's very active during the day and regularly hits 6 miles of activity just playing. She's your classic ADHD kid. She's not on any meds, doesn't eat junk food (she's gluten/dairy free which rules it out for the most part).

The wakings looked random until I changed how I was looking at it, probably 98% of the wakings are in group bands. If I started timing from the beginning of 1 grouping to the next its like clock work plus or minus a couple minutes but its every 30 minutes with 1 or 2,  60 minute stretches. Only a couple nights have a 2 hour block.

We did see the Dr about it Friday, he's ordering a sleep study and mentioned possibly blood sugar issues causing it but giving her something to stabilize her sugar the past 2 nights hasn't made a difference.

The room she's in is quiet, door kept closed and there doesn't seem to be any outside factors that could be messing with her sleep. She's just a very restless sleeper tossing and turning all night, even when she's not moving the fitbit is recording her sleep is disturbed. (we share a room so I can see her sleeping)

Any thoughts on what could be going on? There is only 1 pediatric sleep person within a couple of hours and he's booked clear to Oct so we have a long wait.

[SunsetRunner]

Fitbit (for adults) is barely capable of providing approximations for exercise and calories, and is

inadequate to analyse sleep. It is a somewhat technologically sophisticated devices, but absolutely

not a medical device. The Fitbit should not be used for any children, particularly not sleep tracking.

[trainer]

Check into things like what does she do before sleeping? what does she eat? Also, you share a room, is there something you are doing that might be an issue? She might have something like sleep apnea or allergies or light sensitivity or need more melatonin or... there are so many possibilities that the sleep study is really going to be your best idea. Most people with sleep issues are taught to keep a sleep journal (what they ate, what they did for 4 hours before sleep, how they felt, temp of room, etc) she might be old enough for this.