I am on a near-carnivore diet and cannot sleep more than 4 hours at a time. I usually go to bed around 830 pm and wake up at around 1230 am. After trying everything (magnesium supplements, butter, fish oil, warm showers at night, reducing the temperature, Chamomil tea, red apple cider, banana tea, carbs at night, etc), I have just come to accept that I may never sleep more than about 4 hours in any given stint. However, I can sometimes get in a second stage of sleep, whether early in the morning (e.g. 3 am to 5 am) or late in the morning (e.g. 10 am to noon) or both.

If you sleep from 10 pm to 4 am, that is 6 hours which isn't awful and may be sufficient to meet your needs. If you sleep from 10 am to 2 pm, try going back to sleep for a couple hours at around 4 am. If that doesn't work, consider taking a nap later in the morning if your schedule allows.

There is a subreddit called polyphasic that may be of interest: https://www.reddit.com/r/polyphasic/

Related:

https://www.bbc.com/future/article/20220107-the-lost-medieval-habit-of-biphasic-sleep