Where can I find list of target selectors, ones that go after @a, @p etc in Minecraft Bedrock

Solution 1:

Your one-stop go-to for all the information you will ever need about commands and more is the Minecraft Wiki. The information provided is primarily for Java Edition, but the Bedrock Edition information is mixed in there, if you're willing to find it.

This page shows everything you need to know about target selectors. It shows each argument and what it does, plus some helpful hints and tips.

What's really handy is the table on the right side of the page, which I've screenshotted below. It is a list of all the target selector arguments, and you can read the main article for detailed information.

Unfortunately, your two requests (sleeping/not sleeping, permissions) are not available.

Have fun on your research!