Night splints are great but I wouldn’t wear it all night. I have had plantar for years now unfortunately and the night splint i wear in the evenings anywhere from 1-2 hours (between both my feet). What it does is stretches out the muscle and forces it to stay stretched for the duration of wearing it. I’ve learned thru PT that the long term stretch holds Can help strengthen and loosen the plantar and thus reduce this pain. It’s not a cure but helps me daily as my pain is the worst at night.