You keep your current health when entering Somu's dream, so I keep walking in there with red health, it's hella annoying.
I can only assume this was an oversight. Spawning back on the voerworld after the dream heals you up anyway, so entering the dream should heal you up as well.
#Somu's dream should start at full health
prime grotto
unique pine
i can imagine this being annoying for someone running a low health build to be fair, there's some equipment mods that buff you at crit health