visheshagy aisa maanate hai kee is tarah kee pravrti ke lie jeen zimmedaar hai. neend man aur shareer kee ek svaabhaavik roop se aavartee avastha hai. jisakee visheshata chetana ko parivartit karana gatividhi maansapeshiyon kee gatividhi mein kamee aur teevr netr gati (aareeem) neend ke dauraan lagabhag sabhee svaichchhik maansapeshiyon ka nishedh aur parivesh ke saath baatacheet mein kamee hai. yah jaagrti se uttejanaon par pratikriya karane kee kam kshamata se alag hai.