Just got to dh's grandmothers for thanksgiving, and Lo (4 months) is sleeping in her car seat. Dh is setting up the pnp while I wait with her in the car. If she sleeps through the transfer, can we leave her to sleep in the seat? With the straps tight?

She usually wakes up around 1 am anyway and it's 9:30 now. We will be sleeping in the same room as her. Wwyd?