Can I get some help with data sleep mode on my Sony?

[AC Question]

Data sleep mode on Sony

Hi All,

I have few questions on Data usage / whats app on sony Xperia C

1. If I dont use my cell for Long time ( 5-6 hours) , will the internet data gets stop by going in sleep mode ? (no stamina mode active)

2. For some people whats app message gets delivered immediately & for other after few hours also (internet setting not changed)

Thanks