Just at the end of my first 72 hour fast, so I’m not super experienced but these are what have worked for me:
When I feel hunger pangs in my stomach I drink a seltzer water (like LaCroix) and chase it with ice water. Basically try to fill up my stomach with cold liquid and gas. Seems to trick it into thinking I’m full. But after a few hours it just goes away on its own. Hunger is a part of circadian rhythms and comes in waves
I drink a glass of electrolyte powder every morning. This has been a huge help. I use Ultima brand
To help me sleep I take a double dose of my sleeping pill. I still wake up in the middle of the night more often than when I’m not fasting, though.