I agree with Ian. I have left my boat in the water all summer and no issues. I go camping and leave her in the water for a week without any issues.
On the other side if it gives you piece of mind then do it. It will take 30 sec's to shut them off and turn them on. i have found that no matter what other people do if i worry about my boat at night i will not sleep so i will take the extra step just for my own piece of mind.
2008 Outback V - Sold but never forgotten.
“Do not wait; the time will never be “just right.” Start where you stand, and work with whatever tools you may have at your command, and better tools will be found as you go along." -Napoleon Hill