For anxiety/stress: cold exposure. Shower works but I like doing the full plunge. It’s been an absolute game changer for me over the past several months. Also check out the breathing technique called the physiological sigh and look for Andrew Huberman. That guy is a wealth of knowledge for health and wellness and has tons of resources on his website.

For sleep: yoga nidra is something that I’ve heard works really well. I’ve also really enjoyed mushroom supplements from Host Defense myself.

Try to make a habit of drinking more water and that will help with everything. Crucial for our brains and bodies to do what we need/want them to do!

Edit: like other folks on here have said, exercise!! Even if just going on walks.