Convert iMessage to texts?

hi,

Is there any way to convert iMessages into texts if the recipient doesn't have wifi or data on? For example, I turn off my wifi and data connection overnight to save my (rubbish) iPhone 6 battery, which means I don't get any messages from iPhone users until the morning, but I get texts from non-iPhone users at this time. Is there a way to change iMessages into texts if they can't be delivered? I've not been able to respond to several urgent messages from iPhone users over the last couple of nights because I don't see them until I connect in the morning.

thanks in advance!