Standby battery drain

Hopefully, this is the right thread. So what is the standby battery all of you are getting on the phone. My phone was at 90% at 12.30 am. Put the phone on battery save mode and went to sleep. Wake up at 7 am and the battery drain is down to 67%. I am just clueless how this is possible? Is it normal in Android? I remember on iOS, the battery would go down just 1% - 2% the entire night. Also new notifications were installed and nor were any updates happening in the background (not that i am aware of any).

This is a serious concern for me? If its normal then i might take it to Samsung. The phone is not even a week old.

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