Lots of great advice here already, the only thing I'd add is 4-7-8 breathing. There are lots of guides and explanations online, but essentially you breath in for 4 seconds, hold your breath for 7 seconds, then exhale for 8 seconds.
It takes practice before you can do it and stay relaxed at the same time, so I would suggest practicing during the daytime so when you do it at night it doesn't fully wake you up. It took about a week of practice before I felt comfortable enough to feel the benefit, but I still use 4-7-8 breathing in lots of contexts four years later.
I think the theory behind it is tied to vagus nerve and helping the body relax and enter rest and digest states.
Lots of great advice here already, the only thing I'd add is 4-7-8 breathing. There are lots of guides and explanations online, but essentially you breath in for 4 seconds, hold your breath for 7 seconds, then exhale for 8 seconds.
It takes practice before you can do it and stay relaxed at the same time, so I would suggest practicing during the daytime so when you do it at night it doesn't fully wake you up. It took about a week of practice before I felt comfortable enough to feel the benefit, but I still use 4-7-8 breathing in lots of contexts four years later.
I think the theory behind it is tied to vagus nerve and helping the body relax and enter rest and digest states.