I've done multiple late evening and night launches from Loma. It's awesome scenery everytime. The beavers are tail slapping friendly, stars are sick, especially during a meteor shower, and my daughter sleeps on the raft when it gets real late. Full moon is fun as well, and with long kayaks you can launch Friday evening, cruise to BR camps to sleep, then cruise to the Westwater put-in in the morning, where you can grab your playboat for the Westy weekend trip. If you are short on time, night time paddling can help squeeze in some great trips, and for me one of the greatest things about camping on the river is the ability to be on the water in the late evening and early morning hours.
OP, check your PM, on the DL, to the RHT. Or something.