nNow I will go to sleep and pray for good night’s sleeping because tomorrow is a day Vvery important day. Now I will go to sleep and pray for good night’s sleep because tomorrow is a very important day.

nNow I am goingo to sleep and will pray for a good sleepingnight's rest because tomorrow is a day Vvery important day. Now I am going to sleep and will pray for a good night's rest because tomorrow is a very important day.

Some tensing and word order but mainly wanted to comments on the change from sleep to rest. Rest is another word for sleep, but when we want to say we hope for a "good sleep" we tend to say things like "good rest" or "for restful sleep".

nNow, I will go to sleepbed and pray for a good sleeping because tomorrow is a day Vvery important day. Now, I will go to bed and pray for a good sleep because tomorrow is a very important day.