I'm going to sound like a quack, but... I had long Covid for years. It was horrible. I said f it and started trying internet 'folk' remedies. Simply taking melatonin at night had me so much better in a month. I have mountain biked every day for the last two weeks it is awesome (other than my zero leg strength). Before that I didn't really even leave the house for 3 years. And I can think and write code at the level I used to again now that the brain fog is lifted. I think there were trials on this and they determined it didn't work but it's crazy a little bottle from the grocery store (USA here so it's over the counter) changed my life.
Melatonin and Magnesium together at night is amazing, if you want to keep experimenting. Watch out for the pre-packaged combos though that usually have Magnesium Oxide and is a bit laxative. I prefer Magnesium Glycinate which is a bit gentler on my stomach.
I’ve been very happy with Magnesium Threonate. It’s supposedly more efficient at crossing the blood-brain barrier than the Glycinate. (Both Threonate and Glycinate are more efficiently absorbed in the gut than the Oxide.)
I take a mix of L-Theanine and Magnesium Threonate before bed and sleep way better now (feel more rested with fewer hours of sleep, and the FitBit confirms I get more deep and REM sleep).
Personally I didn’t have good luck with melatonin. It puts me to sleep fine, but I tend to wake up exhausted after ~4 hours and unable to fall asleep again.
