Nangona ingomnye wemikhwa enzima kakhulu ukuyoyisa, utywala bunokunyangeka ngempumelelo. Kukho iindlela ezahlukeneyo zonyango eziqinisekisiweyo nezisebenzayo kwabo baphila notywala, kuquka unyango lokukhanya okubomvu. Nangona olu hlobo lonyango lusenokubonakala lungaqhelekanga, lubonelela ngeenzuzo ezininzi, ezinje:
Impilo Yengqondo Ephuculweyo: Iiseshoni zonyango ngokukhanya okubomvu kunye nonyango ngokukhanya okubomvu, ngokubanzi, zifunyenwe zinceda ekunciphiseni ixhala kunye noxinzelelo. Oku kunceda umntu ukuba aphile emva kotywala ukuba aphumle, angene kwisimo sengqondo esakhayo, kwaye anciphise ukucaphuka. Ngokuphucula imeko yengqondo yomntu, umntu unokuzinikela ngokulula ekuchacheni kwakhe.
Umjikelo Wokulala Wendalo: Abantu abaninzi abasebenzisa utywala bakufumanisa kunzima ukulala xa sele bengaselali. Unyango lokukhanya okubomvu lunokuba luncedo. Enye yezizathu zeengxaki zokulala kukukhanya okungacwangciswanga ngexesha lokuvuka. Ngokuzibeka kukukhanya okubomvu okuqaqambileyo ngexesha leeseshoni zonyango lokukhanya okubomvu, ukukhanya ngokwako kunceda ngokungazi ukuba kuqiniswe umahluko phakathi kokuvuka nokulala.