Sleeping advice.

[Tinkerjack]

We have a 7 year old daughter and an 8 year old son. They are both homeschooled and seem to think that this means they don't have to sleep at a reasonable time. We have tried everything we can think of, so any advice would be great.
We have tried putting a film on (nothing too stimulating) reading to them / using reading apps. Playing relaxing calm music. We've tried wearing them out but they are always exhausted in the car (we don't let them sleep though)but when we get home they get a second lease of life.
We've done Lavender baths, lavender under their pillows. Our daughter will drink milk but our son won't. We always wake them early too. We really don't know what else to try and my husband and I are like zombies all the time.
Any advice would be great.
Thank-you

sorry to hear this, @Tinkerjack - there's nothing worse than sleep deprivation! Hopefully folk will be along soon with some advice. Best of luck.

First thing, stop using any electronic devices at least one hour before bedtime, 2 hours would be better. It's not the content on the screen to cause over-excitement but just the high screens frame rate and the blue light. Reading on a paper book is much better.
Limit all the screen time to maximum 1 hour a day, less would be better. Limit games on screen too, they cause anxiety and over-excitement too.
Set an evening routine: dinner, shower, pajamas, bathroom, bed...
Then set a precise bedtime and clear rules about it, like not going to bed or stay in it mean something like 20 minutes earlier bedtime the next night and/or loosing privileges the next day (like no screen at all), and stick with it. This worked for me as a kid and preteen, and worked with my DDs too.
Hope that helps you!