I'm almost certain I've read about mamas doing that.

My only caveat is that getting that bottle of ebm (expressed breast milk) can be difficult and might take up more of your time during the day than you're saving at night.
If you need a break, my first inclination would be to see about your dh handling the morning time with your baby, waking up, diaper change, and so forth. Also assuming you're already doing side lying nursing and have the baby in bed with you with enough room to move away from him when he's not latched on.
Which is not to say "don't do the bottle thing", just sharing what I've done that made it so I don't need a break at night. (although it's lovely to wake up and hear how dh took care of her toileting needs during the night.

)