when should surah yaseen and surah Rahman be recited?

waise to ye surah kabhi bhi padh sakte hain lekin kuch special moment bhi hain,,, yasin ke baare me imam ali ki hadees hai,jab bhooke ho,pyase ho,lebas na ho,kunware ho,dar me ho,mareez ho,jail me ho,safar me ho,maut ke waqt,koi cheez kho gai ho talash karna ho to in sab jaghon par surae yasin padho……….surae rahman munafeqat door karta hai,mayyat ko faeda deta hai,jab koi nemat mile etc..