Ive had nissen but still get some reflux in the morning particularly as i turn in bed. My bed is well elevated but the pressure pushes the reflux up hill.
Ive been on you tube and searched .. yoga bloating. Before bed i do 20min yoga trapped wind session to release trapped wind and this minimises/stops the morning reflux. At the min for me its about pressure build up in my stomach .. possibly my nissen may have to be revisited due to trapped wind .. see consultant 26jan.
By the way .. i cant do all the yoga exercises properly but do what i can to compress stomach/intestines to release air.