Why am I still receiving notifications when flight mode is on?

Every night I turn flight mode on (and my wifi is also definitely off) and yet I still receive notifications from several apps that would require me to be connected to the internet. For example I get whatsapp messages and emails throughout the night (some but not all of them). I am thinking that my phone will somehow connect to the internet at some point throughout the night for a brief period but I don't know how/why and would like to stop it!

Cheers

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